diff --git a/.github/workflows/public-ci.yml b/.github/workflows/public-ci.yml
index c1a9ec674..c3eb87ee0 100644
--- a/.github/workflows/public-ci.yml
+++ b/.github/workflows/public-ci.yml
@@ -51,6 +51,9 @@ jobs:
       - name: Build source, components and demo
         run: pnpm build
 
+      - name: Verify CAD color mode integration
+        run: pnpm --filter @file-viewer/renderer-cad verify:color-mode
+
       - name: Verify PPTX generated styles
         run: pnpm exec vitest run test/pptx-generated-style-regression.spec.ts
 
diff --git a/packages/components/vue3/src/package/common/type.ts b/packages/components/vue3/src/package/common/type.ts
index e73340882..ce5b37e67 100644
--- a/packages/components/vue3/src/package/common/type.ts
+++ b/packages/components/vue3/src/package/common/type.ts
@@ -2,6 +2,7 @@ import type {
   FileViewerAiOptions as CoreFileViewerAiOptions,
   FileViewerArchiveOptions as CoreFileViewerArchiveOptions,
   FileViewerBeforeOperation as CoreFileViewerBeforeOperation,
+  FileViewerCadColorMode as CoreFileViewerCadColorMode,
   FileViewerCadDwfLineWeightMode as CoreFileViewerCadDwfLineWeightMode,
   FileViewerCadOptions as CoreFileViewerCadOptions,
   FileViewerCadRenderer as CoreFileViewerCadRenderer,
@@ -110,6 +111,7 @@ export type FileViewerSpreadsheetOptions = CoreFileViewerSpreadsheetOptions;
 export type FileViewerTypstOptions = CoreFileViewerTypstOptions;
 
 export type FileViewerCadRenderer = CoreFileViewerCadRenderer;
+export type FileViewerCadColorMode = CoreFileViewerCadColorMode;
 export type FileViewerCadDwfLineWeightMode = CoreFileViewerCadDwfLineWeightMode;
 
 /**
diff --git a/packages/components/vue3/src/package/index.ts b/packages/components/vue3/src/package/index.ts
index dca994c4b..27acc31ce 100644
--- a/packages/components/vue3/src/package/index.ts
+++ b/packages/components/vue3/src/package/index.ts
@@ -107,6 +107,7 @@ export type {
   FileViewerApplyViewStateOptions,
   FileViewerArchiveOptions,
   FileViewerBeforeOperation,
+  FileViewerCadColorMode,
   FileViewerCadDwfLineWeightMode,
   FileViewerCadOptions,
   FileViewerCadRenderer,
diff --git a/packages/core/src/contracts/types.ts b/packages/core/src/contracts/types.ts
index 1aae40d9e..1c105723b 100644
--- a/packages/core/src/contracts/types.ts
+++ b/packages/core/src/contracts/types.ts
@@ -357,6 +357,8 @@ export type FileViewerMessageKey =
   | 'cad.toolbar.fit'
   | 'cad.toolbar.zoomOut'
   | 'cad.toolbar.zoomIn'
+  | 'cad.toolbar.colorSource'
+  | 'cad.toolbar.monochrome'
   | 'cad.layers.title'
   | 'cad.layers.count'
   | 'cad.layers.merged'
@@ -1108,6 +1110,7 @@ export interface FileViewerDrawingOptions {
 
 export type FileViewerCadRenderer = 'auto' | 'webgl' | 'canvas2d';
 export type FileViewerCadDwfLineWeightMode = 'adaptive' | 'physical' | 'hairline';
+export type FileViewerCadColorMode = 'source' | 'monochrome';
 export type FileViewerCadFitMode = 'best' | 'native';
 
 export interface FileViewerCadOptions {
@@ -1118,6 +1121,12 @@ export interface FileViewerCadOptions {
   useWorker?: boolean;
   workerTimeoutMs?: number;
   renderer?: FileViewerCadRenderer;
+  /** Initial CAD color policy. `monochrome` applies one plot color without mutating source data. */
+  colorMode?: FileViewerCadColorMode;
+  /** CSS color used by monochrome mode. Defaults to the CAD foreground color. */
+  monochromeColor?: string;
+  /** Shows the CAD toolbar color-mode toggle. Defaults to true. */
+  showColorModeToggle?: boolean;
   preferDwgWasm?: boolean;
   includePaperSpace?: boolean;
   maxInsertDepth?: number;
diff --git a/packages/core/src/headless.ts b/packages/core/src/headless.ts
index 2e63f6e27..f26c708cd 100644
--- a/packages/core/src/headless.ts
+++ b/packages/core/src/headless.ts
@@ -450,6 +450,7 @@ export type {
   FileViewerArchiveOptions,
   FileViewerApplyViewStateOptions,
   FileViewerBeforeOperation,
+  FileViewerCadColorMode,
   FileViewerCadDwfLineWeightMode,
   FileViewerCadOptions,
   FileViewerCadRenderer,
diff --git a/packages/core/src/i18n/messages.de.ts b/packages/core/src/i18n/messages.de.ts
index f74a5ca1c..3baf1d27f 100644
--- a/packages/core/src/i18n/messages.de.ts
+++ b/packages/core/src/i18n/messages.de.ts
@@ -348,6 +348,8 @@ export const DE_DE_MESSAGES: Record<FileViewerMessageKey, string> = {
   "cad.toolbar.fit": "Fit",
   "cad.toolbar.zoomOut": "Herauszoomen",
   "cad.toolbar.zoomIn": "Vergrößern",
+  "cad.toolbar.colorSource": "Originalfarben",
+  "cad.toolbar.monochrome": "Monochrom",
   "cad.layers.title": "Schichten",
   "cad.layers.count": "{count} Artikel",
   "cad.layers.merged": "{name} ({count} zusammengeführte Ebenen)",
diff --git a/packages/core/src/i18n/messages.ja.ts b/packages/core/src/i18n/messages.ja.ts
index be9197afb..5cbf7e2d2 100644
--- a/packages/core/src/i18n/messages.ja.ts
+++ b/packages/core/src/i18n/messages.ja.ts
@@ -349,6 +349,8 @@ export const JA_JP_MESSAGES: Record<FileViewerMessageKey, string> = {
   'cad.toolbar.fit': '全体表示',
   'cad.toolbar.zoomOut': '縮小',
   'cad.toolbar.zoomIn': '拡大',
+  'cad.toolbar.colorSource': '元の色',
+  'cad.toolbar.monochrome': 'モノクロ',
   'cad.layers.title': 'レイヤー',
   'cad.layers.count': '{count} 件',
   'cad.layers.merged': '{name}（同名レイヤー {count} 件を統合）',
diff --git a/packages/core/src/i18n/messages.ts b/packages/core/src/i18n/messages.ts
index fccd9f0f7..01a1658d2 100644
--- a/packages/core/src/i18n/messages.ts
+++ b/packages/core/src/i18n/messages.ts
@@ -367,6 +367,8 @@ const ZH_CN_MESSAGES: Record<FileViewerMessageKey, string> = {
   'cad.toolbar.fit': '适配',
   'cad.toolbar.zoomOut': '缩小',
   'cad.toolbar.zoomIn': '放大',
+  'cad.toolbar.colorSource': '彩色',
+  'cad.toolbar.monochrome': '黑白',
   'cad.layers.title': '图层',
   'cad.layers.count': '{count} 项',
   'cad.layers.merged': '{name}（已合并 {count} 个同名图层）',
@@ -822,6 +824,8 @@ const EN_US_MESSAGES: Record<FileViewerMessageKey, string> = {
   'cad.toolbar.fit': 'Fit',
   'cad.toolbar.zoomOut': 'Zoom out',
   'cad.toolbar.zoomIn': 'Zoom in',
+  'cad.toolbar.colorSource': 'Source colors',
+  'cad.toolbar.monochrome': 'Monochrome',
   'cad.layers.title': 'Layers',
   'cad.layers.count': '{count} items',
   'cad.layers.merged': '{name} ({count} merged layers)',
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 3e294c561..c35f6f5e3 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -1105,6 +1105,7 @@ export type {
   FileViewerArchiveOptions,
   FileViewerApplyViewStateOptions,
   FileViewerBeforeOperation,
+  FileViewerCadColorMode,
   FileViewerCadDwfLineWeightMode,
   FileViewerCadOptions,
   FileViewerCadRenderer,
diff --git a/packages/renderers/cad/README.en.md b/packages/renderers/cad/README.en.md
index 7a89141a8..bb7c28599 100644
--- a/packages/renderers/cad/README.en.md
+++ b/packages/renderers/cad/README.en.md
@@ -49,3 +49,17 @@ For private deployments, override them with `options.cad.wasmPath`, `options.cad
 ## Migration Note
 
 CAD preview has moved completely out of `@file-viewer/core`. Core now only keeps the asset manifest, shared types, and a compatibility error message, and it no longer installs `@flyfish-dev/cad-viewer` by default. Install this package and pass it through `renderers`, or use `@file-viewer/preset-all` for the complete CAD experience.
+
+## Monochrome plot mode
+
+Set `cad.colorMode` to `source` or `monochrome`. Monochrome rendering uses the CAD engine's entity-color policy rather than a CSS filter, keeping Canvas, WebGL, text overlays and native DWF output consistent while preserving alpha, line types, line weights and source data.
+
+```ts
+{
+  cad: {
+    colorMode: 'monochrome',
+    monochromeColor: '#000000',
+    showColorModeToggle: true,
+  },
+}
+```
diff --git a/packages/renderers/cad/README.md b/packages/renderers/cad/README.md
index f60b6d100..d6373bdf1 100644
--- a/packages/renderers/cad/README.md
+++ b/packages/renderers/cad/README.md
@@ -49,3 +49,17 @@ const options = {
 ## 迁移说明
 
 CAD 预览已经从 `@file-viewer/core` 中彻底移出，core 只保留资产 manifest、类型和兼容错误提示，不再默认安装 `@flyfish-dev/cad-viewer`。完整 CAD 能力请安装本包并传入 `renderers`，或直接使用 `@file-viewer/preset-all`。
+
+## 黑白出图模式
+
+`cad.colorMode` 可设为 `source` 或 `monochrome`。黑白模式通过 CAD 引擎的实体颜色策略实现，不使用 CSS 滤镜，因此 Canvas、WebGL、文字覆盖层及原生 DWF 渲染可保持一致，同时保留透明度、线型、线宽和源文件数据。
+
+```ts
+{
+  cad: {
+    colorMode: 'monochrome',
+    monochromeColor: '#000000',
+    showColorModeToggle: true,
+  },
+}
+```
diff --git a/packages/renderers/cad/package.json b/packages/renderers/cad/package.json
index b90e2104f..5501ffa0d 100644
--- a/packages/renderers/cad/package.json
+++ b/packages/renderers/cad/package.json
@@ -57,7 +57,8 @@
   ],
   "scripts": {
     "build": "tsc -b tsconfig.json",
-    "type-check": "tsc -b tsconfig.json"
+    "type-check": "tsc -b tsconfig.json",
+    "verify:color-mode": "node scripts/verify-color-mode.mjs"
   },
   "dependencies": {
     "@file-viewer/core": "workspace:3.0.0",
diff --git a/packages/renderers/cad/scripts/verify-color-mode.mjs b/packages/renderers/cad/scripts/verify-color-mode.mjs
new file mode 100644
index 000000000..9aaccd772
--- /dev/null
+++ b/packages/renderers/cad/scripts/verify-color-mode.mjs
@@ -0,0 +1,40 @@
+import assert from 'node:assert/strict';
+
+import {
+  applyCadViewerColorMode,
+  normalizeFileViewerCadColorMode,
+  resolveCadViewerSourceDocument,
+  resolveFileViewerCadMonochromeColor,
+  supportsCadViewerColorMode,
+} from '../dist/colorMode.js';
+
+assert.equal(normalizeFileViewerCadColorMode('monochrome'), 'monochrome');
+assert.equal(normalizeFileViewerCadColorMode('source'), 'source');
+assert.equal(normalizeFileViewerCadColorMode('unexpected'), 'source');
+assert.equal(resolveFileViewerCadMonochromeColor('  #101820  '), '#101820');
+assert.equal(resolveFileViewerCadMonochromeColor(undefined), '#000000');
+
+const calls = [];
+const viewer = {
+  setColorMode(mode, color) {
+    calls.push([mode, color]);
+  },
+};
+
+assert.equal(supportsCadViewerColorMode(viewer), true);
+assert.equal(applyCadViewerColorMode(viewer, 'monochrome', '#000000'), true);
+assert.deepEqual(calls, [['monochrome', '#000000']]);
+assert.equal(applyCadViewerColorMode({}, 'source', '#000000'), false);
+
+const parserDocument = { metadata: { parserOwned: true } };
+const renderDocument = { metadata: { renderOnly: true } };
+assert.equal(resolveCadViewerSourceDocument({
+  getSourceDocument: () => parserDocument,
+  getDocument: () => renderDocument,
+}), parserDocument);
+assert.equal(resolveCadViewerSourceDocument({
+  getDocument: () => renderDocument,
+}), renderDocument);
+assert.equal(resolveCadViewerSourceDocument(undefined), undefined);
+
+console.log('CAD color mode integration checks passed.');
diff --git a/packages/renderers/cad/src/cad.ts b/packages/renderers/cad/src/cad.ts
index 072e21c69..bbae4fe61 100644
--- a/packages/renderers/cad/src/cad.ts
+++ b/packages/renderers/cad/src/cad.ts
@@ -31,6 +31,7 @@ import {
   unregisterFileViewerZoomProvider,
   type FileViewerApplyViewStateOptions,
   type FileRenderContext,
+  type FileViewerCadColorMode,
   type FileViewerCadOptions,
   type FileViewerFitRequest,
   type FileViewerFitResult,
@@ -40,6 +41,13 @@ import {
   type FileViewerViewStateChangeSource,
   type FileViewerZoomState,
 } from '@file-viewer/core';
+import {
+  applyCadViewerColorMode,
+  normalizeFileViewerCadColorMode,
+  resolveFileViewerCadMonochromeColor,
+  resolveCadViewerSourceDocument,
+  supportsCadViewerColorMode,
+} from './colorMode';
 
 type CadStatus = 'loading' | 'ready' | 'error';
 
@@ -63,6 +71,9 @@ const cadStyle = `
 .cad-tools,.cad-meta{display:flex;align-items:center;gap:8px}
 .cad-tools button{min-width:34px;min-height:30px;border:0;border-radius:8px;background:rgba(15,23,42,.06);color:#25344c;cursor:pointer;font-weight:800;letter-spacing:0;transition:background-color .18s ease,color .18s ease}
 .cad-tools button:hover{background:rgba(31,150,110,.14);color:#0f8f62}
+.cad-tools button.cad-color-mode{min-width:52px;padding:0 10px;font-size:12px}
+.cad-tools button.cad-color-mode[aria-pressed='true']{background:#0f172a;color:#fff}
+.cad-tools button.cad-color-mode:disabled{cursor:not-allowed;opacity:.46}
 .cad-zoom,.cad-meta span{color:#64748b;font-size:12px;font-weight:800;letter-spacing:0}
 .cad-meta span{border-radius:999px;padding:5px 9px;background:rgba(15,23,42,.06)}
 .cad-body{display:grid;min-height:0;flex:1;grid-template-columns:minmax(176px,236px) minmax(0,1fr) minmax(142px,176px);background:#eef2f7}
@@ -791,6 +802,8 @@ export default async function renderCad(
   const options: FileViewerCadOptions = context?.options?.cad || {};
   const t = createFileViewerTranslator(context?.options);
   const locale = resolveFileViewerLocale(context?.options);
+  const monochromeColor = resolveFileViewerCadMonochromeColor(options.monochromeColor);
+  let colorMode = normalizeFileViewerCadColorMode(options.colorMode);
   let status: CadStatus = 'loading';
   let progressMessage = t('cad.state.loadingViewer');
   let errorMessage = '';
@@ -817,16 +830,18 @@ export default async function renderCad(
   const zoomOutButton = createElement('button', undefined, '-') as HTMLButtonElement;
   const zoomText = createElement('span', 'cad-zoom', '100%');
   const zoomInButton = createElement('button', undefined, '+') as HTMLButtonElement;
+  const colorModeButton = createElement('button', 'cad-color-mode') as HTMLButtonElement;
+  colorModeButton.hidden = options.showColorModeToggle === false;
   const meta = createElement('div', 'cad-meta');
   const typeMeta = createElement('span', undefined, normalizedType.toUpperCase());
   const backendMeta = createElement('span', undefined, 'AUTO');
-  [fitButton, zoomOutButton, zoomInButton].forEach(button => {
+  [fitButton, zoomOutButton, zoomInButton, colorModeButton].forEach(button => {
     button.type = 'button';
   });
   fitButton.title = t('cad.toolbar.fit');
   zoomOutButton.title = t('cad.toolbar.zoomOut');
   zoomInButton.title = t('cad.toolbar.zoomIn');
-  tools.append(fitButton, zoomOutButton, zoomText, zoomInButton);
+  tools.append(fitButton, zoomOutButton, zoomText, zoomInButton, colorModeButton);
   meta.append(typeMeta, backendMeta);
   toolbar.append(tools, meta);
 
@@ -905,6 +920,8 @@ export default async function renderCad(
       status,
       view: viewState ? { ...viewState } : null,
       backend: renderStats?.backend,
+      colorMode,
+      monochromeColor: colorMode === 'monochrome' ? monochromeColor : undefined,
       layerCount: layers.length,
       visibleLayers: layers
         .filter(layer => layer.isVisible !== false && !layer.isFrozen)
@@ -1051,12 +1068,14 @@ export default async function renderCad(
         : layer.name;
       button.setAttribute('aria-pressed', String(layerVisible));
       const color = createElement('span', 'cad-layer-color');
-      if (typeof layer.color === 'string') {
+      if (colorMode === 'monochrome') {
+        color.style.background = monochromeColor;
+      } else if (typeof layer.color === 'string') {
         color.style.background = layer.color;
       }
       button.append(color, createElement('span', undefined, layer.name));
       button.addEventListener('click', () => {
-        const document = viewer?.getDocument();
+        const document = resolveCadViewerSourceDocument(viewer) as CadDocument | undefined;
         if (!document) {
           return;
         }
@@ -1085,6 +1104,15 @@ export default async function renderCad(
   const syncState = () => {
     zoomText.textContent = `${getZoomPercent()}%`;
     backendMeta.textContent = (renderStats?.backend || 'auto').toUpperCase();
+    const colorModeSupported = supportsCadViewerColorMode(viewer);
+    colorModeButton.disabled = status !== 'ready' || !colorModeSupported;
+    colorModeButton.setAttribute('aria-pressed', String(colorMode === 'monochrome'));
+    colorModeButton.textContent = t(colorMode === 'monochrome'
+      ? 'cad.toolbar.monochrome'
+      : 'cad.toolbar.colorSource');
+    colorModeButton.title = t(colorMode === 'monochrome'
+      ? 'cad.toolbar.colorSource'
+      : 'cad.toolbar.monochrome');
     state.hidden = status === 'ready';
     state.classList.toggle('error', status === 'error');
     if (status === 'loading') {
@@ -1240,6 +1268,17 @@ export default async function renderCad(
   fitButton.addEventListener('click', () => fitToView());
   zoomInButton.addEventListener('click', zoomIn);
   zoomOutButton.addEventListener('click', zoomOut);
+  colorModeButton.addEventListener('click', () => {
+    const previousMode = colorMode;
+    colorMode = colorMode === 'monochrome' ? 'source' : 'monochrome';
+    if (!applyCadViewerColorMode(viewer, colorMode, monochromeColor)) {
+      colorMode = previousMode;
+      syncState();
+      return;
+    }
+    syncUi();
+    emitCadViewStateChange('cad-view-change', 'user');
+  });
 
   const createViewer = () => {
     const { wasmPath, workerUrl, dwfWasmUrl } = resolveFileViewerCadAssetUrls(
@@ -1284,6 +1323,7 @@ export default async function renderCad(
       dwfMaxOverviewStrokeCssPx: options.dwfMaxOverviewStrokeCssPx,
       dwfMinTextCssPx: options.dwfMinTextCssPx,
       dwfMinFilledAreaCssPx: options.dwfMinFilledAreaCssPx,
+      ...({ colorMode, monochromeColor } as Record<string, unknown>),
       autoFit: true,
       canvasOptions,
       onLoadProgress: updateProgress,
diff --git a/packages/renderers/cad/src/colorMode.ts b/packages/renderers/cad/src/colorMode.ts
new file mode 100644
index 000000000..7511ecd56
--- /dev/null
+++ b/packages/renderers/cad/src/colorMode.ts
@@ -0,0 +1,38 @@
+import type { FileViewerCadColorMode } from '@file-viewer/core';
+
+export interface CadViewerColorModeAdapter {
+  setColorMode?: (mode: FileViewerCadColorMode, monochromeColor?: string) => void;
+  getColorMode?: () => FileViewerCadColorMode;
+  getMonochromeColor?: () => string | undefined;
+}
+
+export function normalizeFileViewerCadColorMode(value: unknown): FileViewerCadColorMode {
+  return value === 'monochrome' ? 'monochrome' : 'source';
+}
+
+export function resolveFileViewerCadMonochromeColor(value: unknown, fallback = '#000000'): string {
+  if (typeof value === 'string' && value.trim()) return value.trim();
+  return fallback;
+}
+
+export function supportsCadViewerColorMode(value: unknown): value is CadViewerColorModeAdapter {
+  return Boolean(value && typeof (value as CadViewerColorModeAdapter).setColorMode === 'function');
+}
+
+export function resolveCadViewerSourceDocument(viewer: unknown): unknown {
+  const candidate = viewer as {
+    getSourceDocument?: () => unknown;
+    getDocument?: () => unknown;
+  } | null | undefined;
+  return candidate?.getSourceDocument?.() ?? candidate?.getDocument?.();
+}
+
+export function applyCadViewerColorMode(
+  viewer: unknown,
+  mode: FileViewerCadColorMode,
+  monochromeColor: string
+): boolean {
+  if (!supportsCadViewerColorMode(viewer)) return false;
+  viewer.setColorMode?.(mode, monochromeColor);
+  return true;
+}
diff --git a/packages/renderers/cad/src/index.ts b/packages/renderers/cad/src/index.ts
index c2a292797..1b03e5f86 100644
--- a/packages/renderers/cad/src/index.ts
+++ b/packages/renderers/cad/src/index.ts
@@ -6,6 +6,15 @@ import {
   type RendererDefinition,
 } from '@file-viewer/core';
 
+export {
+  applyCadViewerColorMode,
+  normalizeFileViewerCadColorMode,
+  resolveCadViewerSourceDocument,
+  resolveFileViewerCadMonochromeColor,
+  supportsCadViewerColorMode,
+} from './colorMode';
+export type { CadViewerColorModeAdapter } from './colorMode';
+
 const cadDefinition = DEFAULT_RENDERER_DEFINITIONS.find(
   definition => definition.id === 'cad'
 ) as RendererDefinition | undefined;