diff --git a/.gitignore b/.gitignore
index cadc19d..7f95bbc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,10 @@ dist/
 /cli-dev
 openclaw/
 
+# start.sh runtime artifacts (pid file + logs dir)
+.fusion-code.pid
+/logs/
+
 # Bun build artifacts
 .*.bun-build
 
diff --git a/start.sh b/start.sh
index ec63e9f..f4aa21b 100755
--- a/start.sh
+++ b/start.sh
@@ -1,18 +1,93 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # start.sh — Fusion-Code API 服务启动脚本
 # 供 Fusion-Studio UpstreamServiceManager 调用
-set -e
+# 支持 start|stop|status 子命令；start 后台 detach，避免被 Studio 30s 超时连带终止
+set -euo pipefail
 
-DIR="$(cd "$(dirname "$0")" && pwd)"
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 cd "$DIR"
 
 PORT="${FUSION_CODE_PORT:-11441}"
 AUTH="${FUSION_API_KEY:-}"
+PID_FILE="$DIR/.fusion-code.pid"
+LOG_DIR="$DIR/logs"
+STDOUT_LOG="$LOG_DIR/stdout.log"
+STDERR_LOG="$LOG_DIR/stderr.log"
 
-if [ ! -f ./fusion-code ]; then
-    echo "[start.sh] Building fusion-code..."
-    bun run build
-fi
+mkdir -p "$LOG_DIR"
 
-echo "[start.sh] Starting Fusion-Code API on port ${PORT}"
-exec ./fusion-code --serve --port="${PORT}" --auth="${AUTH}"
+is_running() {
+    [ -f "$PID_FILE" ] || return 1
+    local pid
+    pid="$(cat "$PID_FILE" 2>/dev/null || true)"
+    [ -n "$pid" ] || return 1
+    kill -0 "$pid" 2>/dev/null
+}
+
+ensure_binary() {
+    if [ ! -f ./fusion-code ]; then
+        echo "[start.sh] Building fusion-code..."
+        bun run build
+    fi
+}
+
+do_start() {
+    if is_running; then
+        echo "[start.sh] fusion-code already running (pid $(cat "$PID_FILE"))"
+        return 0
+    fi
+    ensure_binary
+    echo "[start.sh] Starting Fusion-Code API on port ${PORT}"
+    nohup ./fusion-code --serve --port="${PORT}" --auth="${AUTH}" \
+        >> "$STDOUT_LOG" 2>> "$STDERR_LOG" &
+    local pid=$!
+    echo "$pid" > "$PID_FILE"
+    sleep 1
+    if is_running; then
+        echo "[start.sh] fusion-code started (pid $pid, port $PORT)"
+    else
+        echo "[start.sh] fusion-code failed to start, see $STDERR_LOG" >&2
+        rm -f "$PID_FILE"
+        return 1
+    fi
+}
+
+do_stop() {
+    if ! is_running; then
+        echo "[start.sh] fusion-code not running"
+        rm -f "$PID_FILE"
+        return 0
+    fi
+    local pid
+    pid="$(cat "$PID_FILE")"
+    echo "[start.sh] stopping fusion-code (pid $pid)"
+    kill "$pid" 2>/dev/null || true
+    for _ in 1 2 3 4 5; do
+        kill -0 "$pid" 2>/dev/null || break
+        sleep 1
+    done
+    if kill -0 "$pid" 2>/dev/null; then
+        echo "[start.sh] force kill (pid $pid)"
+        kill -9 "$pid" 2>/dev/null || true
+    fi
+    rm -f "$PID_FILE"
+    echo "[start.sh] fusion-code stopped"
+}
+
+do_status() {
+    if is_running; then
+        echo "running (pid $(cat "$PID_FILE"), port $PORT)"
+        return 0
+    fi
+    echo "stopped"
+    return 1
+}
+
+ACTION="${1:-start}"
+case "$ACTION" in
+    start)  do_start ;;
+    stop)   do_stop ;;
+    status) do_status ;;
+    restart) do_stop || true; do_start ;;
+    *) echo "usage: $0 {start|stop|status|restart}" >&2; exit 1 ;;
+esac