diff --git a/web/classic/src/pages/Setting/Ratio/ModelPricingCombined.jsx b/web/classic/src/pages/Setting/Ratio/ModelPricingCombined.jsx
index 51dfe27d3a6..c008e942ba2 100644
--- a/web/classic/src/pages/Setting/Ratio/ModelPricingCombined.jsx
+++ b/web/classic/src/pages/Setting/Ratio/ModelPricingCombined.jsx
@@ -18,7 +18,7 @@ For commercial licensing, please contact support@quantumnous.com
 */
 
 import React, { useState } from 'react';
-import { Radio, RadioGroup } from '@douyinfe/semi-ui';
+import { Banner, Radio, RadioGroup } from '@douyinfe/semi-ui';
 import { useTranslation } from 'react-i18next';
 import ModelPricingEditor from './components/ModelPricingEditor';
 import ModelRatioSettings from './ModelRatioSettings';
@@ -37,13 +37,25 @@ export default function ModelPricingCombined({ options, refresh }) {
           onChange={(e) => setEditMode(e.target.value)}
         >
           <Radio value='visual'>{t('可视化编辑')}</Radio>
-          <Radio value='manual'>{t('手动编辑')}</Radio>
+          <Radio value='manual'>{t('倍率（高级）')}</Radio>
         </RadioGroup>
       </div>
       {editMode === 'visual' ? (
         <ModelPricingEditor options={options} refresh={refresh} />
       ) : (
-        <ModelRatioSettings options={options} refresh={refresh} />
+        <>
+          <Banner
+            type='warning'
+            bordered
+            fullMode={false}
+            closeIcon={null}
+            style={{ marginBottom: 16 }}
+            description={t(
+              '高级模式：此处编辑的是后端原始倍率（无量纲系数）与美元按次价（ModelPrice），与上方「可视化编辑」的人民币口径不同，请勿混用。不熟悉倍率的话建议使用可视化编辑。',
+            )}
+          />
+          <ModelRatioSettings options={options} refresh={refresh} />
+        </>
       )}
     </div>
   );
diff --git a/web/classic/src/pages/Setting/Ratio/components/ModelPricingEditor.jsx b/web/classic/src/pages/Setting/Ratio/components/ModelPricingEditor.jsx
index 2beafe01d93..2e27fa2e748 100644
--- a/web/classic/src/pages/Setting/Ratio/components/ModelPricingEditor.jsx
+++ b/web/classic/src/pages/Setting/Ratio/components/ModelPricingEditor.jsx
@@ -17,7 +17,7 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
 For commercial licensing, please contact support@quantumnous.com
 */
 
-import React, { useCallback, useMemo, useState } from 'react';
+import React, { useCallback, useContext, useMemo, useState } from 'react';
 import {
   Banner,
   Button,
@@ -45,15 +45,20 @@ import {
   PAGE_SIZE,
   PRICE_SUFFIX,
   buildSummaryText,
+  formatDisplayPrice,
   hasValue,
+  normalizeRate,
   useModelPricingEditorState,
 } from '../hooks/useModelPricingEditorState';
 import { useIsMobile } from '../../../../hooks/common/useIsMobile';
+import { StatusContext } from '../../../../context/Status';
 import TieredPricingEditor from './TieredPricingEditor';
 
 const { Text } = Typography;
 const EMPTY_CANDIDATE_MODEL_NAMES = [];
 
+// 显示固定 2 位（¥4.00），编辑时才展开原始精度串；失焦不回写圆整值，
+// 故 model state 始终保持高精度，序列化不受 2 位显示影响（见设计 §6.1.1）。
 const PriceInput = ({
   label,
   value,
@@ -64,26 +69,40 @@ const PriceInput = ({
   extraText = '',
   headerAction = null,
   hidden = false,
-}) => (
-  <div style={{ marginBottom: 16 }}>
-    <div className='mb-1 font-medium text-gray-700 flex items-center justify-between gap-3'>
-      <span>{label}</span>
-      {headerAction}
+}) => {
+  const [focused, setFocused] = useState(false);
+  const [draft, setDraft] = useState('');
+  const displayValue = focused ? draft : formatDisplayPrice(value);
+  return (
+    <div style={{ marginBottom: 16 }}>
+      <div className='mb-1 font-medium text-gray-700 flex items-center justify-between gap-3'>
+        <span>{label}</span>
+        {headerAction}
+      </div>
+      {!hidden ? (
+        <Input
+          value={displayValue}
+          placeholder={placeholder}
+          onFocus={() => {
+            // 编辑起点用原始高精度串，避免廉价模型（如 ¥0.0146）被 2 位显示圆整后丢精度。
+            setDraft(value ?? '');
+            setFocused(true);
+          }}
+          onBlur={() => setFocused(false)}
+          onChange={(v) => {
+            setDraft(v);
+            onChange(v);
+          }}
+          suffix={suffix}
+          disabled={disabled}
+        />
+      ) : null}
+      {extraText ? (
+        <div className='mt-1 text-xs text-gray-500'>{extraText}</div>
+      ) : null}
     </div>
-    {!hidden ? (
-      <Input
-        value={value}
-        placeholder={placeholder}
-        onChange={onChange}
-        suffix={suffix}
-        disabled={disabled}
-      />
-    ) : null}
-    {extraText ? (
-      <div className='mt-1 text-xs text-gray-500'>{extraText}</div>
-    ) : null}
-  </div>
-);
+  );
+};
 
 export default function ModelPricingEditor({
   options,
@@ -99,6 +118,12 @@ export default function ModelPricingEditor({
 }) {
   const { t } = useTranslation();
   const isMobile = useIsMobile();
+  const [statusState] = useContext(StatusContext);
+  // 优先用页面级、随保存刷新的 options.USDExchangeRate；StatusContext 仅 app 启动加载一次，
+  // 改汇率后同会话不刷新会折算错（写错计费倍率），故仅作兜底。
+  const rate = normalizeRate(
+    options?.USDExchangeRate ?? statusState?.status?.usd_exchange_rate,
+  );
   const [addVisible, setAddVisible] = useState(false);
   const [batchVisible, setBatchVisible] = useState(false);
   const [newModelName, setNewModelName] = useState('');
@@ -136,6 +161,7 @@ export default function ModelPricingEditor({
     t,
     candidateModelNames,
     filterMode,
+    rate,
   });
 
   const getExprModeLabel = useCallback((model) => {
@@ -253,6 +279,17 @@ export default function ModelPricingEditor({
   return (
     <>
       <Space vertical align='start' style={{ width: '100%' }}>
+        <Banner
+          type='info'
+          bordered
+          fullMode={false}
+          closeIcon={null}
+          style={{ width: '100%' }}
+          description={t(
+            '价格单位为人民币（¥），按运营设置的「美元兑人民币汇率」{{rate}} 自动折算为后端倍率存储；价格显示保留 2 位小数，存储仍为高精度，计费不受影响。（注：表达式/阶梯计费仍按美元 $ 计价，不受此折算影响。）',
+            { rate },
+          )}
+        />
         <Space wrap className='mt-2'>
           {allowAddModel ? (
             <Button
@@ -445,7 +482,7 @@ export default function ModelPricingEditor({
                     label={t('固定价格')}
                     value={selectedModel.fixedPrice}
                     placeholder={t('输入每次调用价格')}
-                    suffix={t('$/次')}
+                    suffix={t('¥/次')}
                     onChange={(value) => handleNumericFieldChange('fixedPrice', value)}
                     extraText={t('适合 MJ / 任务类等按次收费模型。')}
                   />
@@ -470,7 +507,7 @@ export default function ModelPricingEditor({
                       <PriceInput
                         label={t('输入价格')}
                         value={selectedModel.inputPrice}
-                        placeholder={t('输入 $/1M tokens')}
+                        placeholder={t('输入 ¥/1M tokens')}
                         onChange={(value) => handleNumericFieldChange('inputPrice', value)}
                       />
                       {selectedModel.completionRatioLocked ? (
@@ -492,7 +529,7 @@ export default function ModelPricingEditor({
                       <PriceInput
                         label={t('补全价格')}
                         value={selectedModel.completionPrice}
-                        placeholder={t('输入 $/1M tokens')}
+                        placeholder={t('输入 ¥/1M tokens')}
                         onChange={(value) =>
                           handleNumericFieldChange('completionPrice', value)
                         }
@@ -535,7 +572,7 @@ export default function ModelPricingEditor({
                       <PriceInput
                         label={t('缓存读取价格')}
                         value={selectedModel.cachePrice}
-                        placeholder={t('输入 $/1M tokens')}
+                        placeholder={t('输入 ¥/1M tokens')}
                         onChange={(value) => handleNumericFieldChange('cachePrice', value)}
                         headerAction={
                           <Switch
@@ -557,7 +594,7 @@ export default function ModelPricingEditor({
                       <PriceInput
                         label={t('缓存创建价格')}
                         value={selectedModel.createCachePrice}
-                        placeholder={t('输入 $/1M tokens')}
+                        placeholder={t('输入 ¥/1M tokens')}
                         onChange={(value) =>
                           handleNumericFieldChange('createCachePrice', value)
                         }
@@ -604,7 +641,7 @@ export default function ModelPricingEditor({
                       <PriceInput
                         label={t('图片输入价格')}
                         value={selectedModel.imagePrice}
-                        placeholder={t('输入 $/1M tokens')}
+                        placeholder={t('输入 ¥/1M tokens')}
                         onChange={(value) => handleNumericFieldChange('imagePrice', value)}
                         headerAction={
                           <Switch
@@ -626,7 +663,7 @@ export default function ModelPricingEditor({
                       <PriceInput
                         label={t('音频输入价格')}
                         value={selectedModel.audioInputPrice}
-                        placeholder={t('输入 $/1M tokens')}
+                        placeholder={t('输入 ¥/1M tokens')}
                         onChange={(value) =>
                           handleNumericFieldChange('audioInputPrice', value)
                         }
@@ -656,7 +693,7 @@ export default function ModelPricingEditor({
                       <PriceInput
                         label={t('音频补全价格')}
                         value={selectedModel.audioOutputPrice}
-                        placeholder={t('输入 $/1M tokens')}
+                        placeholder={t('输入 ¥/1M tokens')}
                         onChange={(value) =>
                           handleNumericFieldChange('audioOutputPrice', value)
                         }
diff --git a/web/classic/src/pages/Setting/Ratio/hooks/useModelPricingEditorState.js b/web/classic/src/pages/Setting/Ratio/hooks/useModelPricingEditorState.js
index ba9efdfcebc..08bf72b5ad5 100644
--- a/web/classic/src/pages/Setting/Ratio/hooks/useModelPricingEditorState.js
+++ b/web/classic/src/pages/Setting/Ratio/hooks/useModelPricingEditorState.js
@@ -24,9 +24,32 @@ import {
 } from '../components/requestRuleExpr';
 
 export const PAGE_SIZE = 10;
-export const PRICE_SUFFIX = '$/1M tokens';
+export const PRICE_SUFFIX = '¥/1M tokens';
+export const DEFAULT_USD2RMB_RATE = 7.3;
 const EMPTY_CANDIDATE_MODEL_NAMES = [];
 
+// 汇率兜底：无效（0 / 空 / 非有限）时回退常量，避免 ÷0 导致价格爆炸。
+export const normalizeRate = (rate) => {
+  const num = Number(rate);
+  return Number.isFinite(num) && num > 0 ? num : DEFAULT_USD2RMB_RATE;
+};
+
+// 显示精度：按实际数字精度展示，小数不足 2 位时补 0 到 2 位（¥4 → 4.00、
+// ¥0.876 → 0.876、¥0.0146 → 0.0146）。先收敛到 10 位去掉往返浮点漂移尾巴
+// （¥4 重载得到 4.000000000004 → 4.00）。仅用于展示，绝不回写存储（见设计 §6.1.1）。
+export const formatDisplayPrice = (value) => {
+  if (!hasValue(value) && value !== 0) {
+    return '';
+  }
+  const num = Number(value);
+  if (!Number.isFinite(num)) {
+    return '';
+  }
+  const trimmed = parseFloat(num.toFixed(10));
+  const decimals = (String(trimmed).split('.')[1] || '').length;
+  return trimmed.toFixed(Math.max(2, decimals));
+};
+
 const EMPTY_MODEL = {
   name: '',
   billingMode: 'per-token',
@@ -101,10 +124,11 @@ const parseOptionJSON = (rawValue) => {
   }
 };
 
-const ratioToBasePrice = (ratio) => {
+// 货币边界：倍率 → 人民币输入价（倍率 × 基准价 2 × 汇率）。
+const ratioToBasePrice = (ratio, rate) => {
   const num = toNumberOrNull(ratio);
   if (num === null) return '';
-  return formatNumber(num * 2);
+  return formatNumber(num * 2 * normalizeRate(rate));
 };
 
 const normalizeCompletionRatioMeta = (rawMeta) => {
@@ -121,7 +145,7 @@ const normalizeCompletionRatioMeta = (rawMeta) => {
   };
 };
 
-const buildModelState = (name, sourceMaps) => {
+const buildModelState = (name, sourceMaps, rate) => {
   const billingMode = sourceMaps.ModelBillingMode?.[name];
   if (billingMode === 'tiered_expr') {
     const fullBillingExpr = sourceMaps.ModelBillingExpr?.[name] || '';
@@ -150,8 +174,13 @@ const buildModelState = (name, sourceMaps) => {
   const audioCompletionRatio = toNumericString(
     sourceMaps.AudioCompletionRatio[name],
   );
-  const fixedPrice = toNumericString(sourceMaps.ModelPrice[name]);
-  const inputPrice = ratioToBasePrice(modelRatio);
+  // 货币边界：ModelPrice 是绝对美元金额，× 汇率得人民币按次价。
+  const rawFixedPrice = toNumberOrNull(sourceMaps.ModelPrice[name]);
+  const fixedPrice =
+    rawFixedPrice === null
+      ? ''
+      : formatNumber(rawFixedPrice * normalizeRate(rate));
+  const inputPrice = ratioToBasePrice(modelRatio, rate);
   const inputPriceNumber = toNumberOrNull(inputPrice);
   const audioInputPrice =
     inputPriceNumber !== null && hasValue(audioRatio)
@@ -304,7 +333,7 @@ export const buildSummaryText = (model, t) => {
   }
 
   if (model.billingMode === 'per-request' && hasValue(model.fixedPrice)) {
-    return `${t('按次')} $${model.fixedPrice} / ${t('次')}${requestRuleSuffix}`;
+    return `${t('按次')} ¥${formatDisplayPrice(model.fixedPrice)} / ${t('次')}${requestRuleSuffix}`;
   }
 
   if (hasValue(model.inputPrice)) {
@@ -318,7 +347,7 @@ export const buildSummaryText = (model, t) => {
     ].filter(hasValue).length;
     const extraLabel =
       extraCount > 0 ? `，${t('额外价格项')} ${extraCount}` : '';
-    return `${t('输入')} $${model.inputPrice}${extraLabel}${requestRuleSuffix}`;
+    return `${t('输入')} ¥${formatDisplayPrice(model.inputPrice)}${extraLabel}${requestRuleSuffix}`;
   }
 
   return `${t('未设置价格')}${requestRuleSuffix}`;
@@ -334,7 +363,8 @@ export const buildOptionalFieldToggles = (model) => ({
   audioOutputPrice: hasValue(model.audioOutputPrice),
 });
 
-const serializeModel = (model, t) => {
+const serializeModel = (model, t, rate) => {
+  const usd2rmb = normalizeRate(rate);
   const result = {
     ModelPrice: null,
     ModelRatio: null,
@@ -348,7 +378,8 @@ const serializeModel = (model, t) => {
 
   if (model.billingMode === 'per-request') {
     if (hasValue(model.fixedPrice)) {
-      result.ModelPrice = toNormalizedNumber(model.fixedPrice);
+      // 人民币按次价 ÷ 汇率 = 后端存储的美元 ModelPrice。
+      result.ModelPrice = toNormalizedNumber(Number(model.fixedPrice) / usd2rmb);
     }
     return result;
   }
@@ -412,7 +443,8 @@ const serializeModel = (model, t) => {
     return result;
   }
 
-  result.ModelRatio = toNormalizedNumber(inputPrice / 2);
+  // 货币边界：人民币输入价 ÷ 汇率 ÷ 基准价 2 = 后端倍率。派生项为同币种比值，汇率自动约掉，不参与换算。
+  result.ModelRatio = toNormalizedNumber(inputPrice / usd2rmb / 2);
 
   if (!model.completionRatioLocked && completionPrice !== null) {
     result.CompletionRatio = toNormalizedNumber(completionPrice / inputPrice);
@@ -452,8 +484,9 @@ const serializeModel = (model, t) => {
   return result;
 };
 
-export const buildPreviewRows = (model, t) => {
+export const buildPreviewRows = (model, t, rate) => {
   if (!model) return [];
+  const usd2rmb = normalizeRate(rate);
   const finalBillingExpr = combineBillingExpr(
     model.billingExpr,
     model.requestRuleExpr,
@@ -492,7 +525,9 @@ export const buildPreviewRows = (model, t) => {
       {
         key: 'ModelPrice',
         label: 'ModelPrice',
-        value: hasValue(model.fixedPrice) ? model.fixedPrice : t('空'),
+        value: hasValue(model.fixedPrice)
+          ? formatNumber(Number(model.fixedPrice) / usd2rmb)
+          : t('空'),
       },
     ];
     return rows;
@@ -565,7 +600,7 @@ export const buildPreviewRows = (model, t) => {
     {
       key: 'ModelRatio',
       label: 'ModelRatio',
-      value: formatNumber(inputPrice / 2),
+      value: formatNumber(inputPrice / usd2rmb / 2),
     },
     {
       key: 'CompletionRatio',
@@ -624,6 +659,7 @@ export function useModelPricingEditorState({
   t,
   candidateModelNames = EMPTY_CANDIDATE_MODEL_NAMES,
   filterMode = 'all',
+  rate = DEFAULT_USD2RMB_RATE,
 }) {
   const [models, setModels] = useState([]);
   const [initialVisibleModelNames, setInitialVisibleModelNames] = useState([]);
@@ -666,7 +702,7 @@ export function useModelPricingEditorState({
     ]);
 
     const nextModels = Array.from(names)
-      .map((name) => buildModelState(name, sourceMaps))
+      .map((name) => buildModelState(name, sourceMaps, rate))
       .sort((a, b) => a.name.localeCompare(b.name));
 
     setModels(nextModels);
@@ -693,7 +729,7 @@ export function useModelPricingEditorState({
           : nextModels;
       return nextVisibleModels[0]?.name || '';
     });
-  }, [candidateModelNames, filterMode, options]);
+  }, [candidateModelNames, filterMode, options, rate]);
 
   const visibleModels = useMemo(() => {
     return filterMode === 'unset'
@@ -729,8 +765,8 @@ export function useModelPricingEditorState({
   );
 
   const previewRows = useMemo(
-    () => buildPreviewRows(selectedModel, t),
-    [selectedModel, t],
+    () => buildPreviewRows(selectedModel, t, rate),
+    [selectedModel, t, rate],
   );
 
   useEffect(() => {
@@ -1056,7 +1092,7 @@ export function useModelPricingEditorState({
         // delay.  ModelPriceHelper checks billing_mode first, so these values
         // are only used when billing_setting hasn't propagated yet.
         try {
-          const serialized = serializeModel(model, t);
+          const serialized = serializeModel(model, t, rate);
           Object.entries(serialized).forEach(([key, value]) => {
             if (value !== null) {
               output[key][model.name] = value;