diff --git a/scripts/start-backend.sh b/scripts/start-backend.sh
index 9222018..28d9fd6 100755
--- a/scripts/start-backend.sh
+++ b/scripts/start-backend.sh
@@ -20,6 +20,7 @@ export OPENAI_API_KEY
 export OPENAI_BASE_URL="${OPENAI_BASE_URL:-http://model.mify.ai.srv/v1}"
 export OPENAI_MODEL="${OPENAI_MODEL:-tongyi/deepseek-v4-pro}"
 export OPENAI_TIMEOUT_SECONDS="${OPENAI_TIMEOUT_SECONDS:-3600}"
+export CLAW_MODEL_IDLE_TIMEOUT_SECONDS="${CLAW_MODEL_IDLE_TIMEOUT_SECONDS:-${OPENAI_TIMEOUT_SECONDS}}"
 
 # 后端也会调用 Node 生态工具，例如 feishu-mcp-pro。systemd 不读取交互式
 # shell 的 nvm 配置，所以需要把部署时记录的 Node 路径显式传给 Python 进程。