diff --git a/orchestrator/backtest_mode.py b/orchestrator/backtest_mode.py
index a0e2488e..604b81d2 100644
--- a/orchestrator/backtest_mode.py
+++ b/orchestrator/backtest_mode.py
@@ -1,9 +1,8 @@
 import logging
 from dataclasses import dataclass, field
 from datetime import datetime, timedelta
-from typing import List, Optional
+from typing import List
 
-from orchestrator.config import OrchestratorConfig
 from orchestrator.signals import FinalSignal
 
 logger = logging.getLogger(__name__)
diff --git a/orchestrator/live_mode.py b/orchestrator/live_mode.py
index b96b5e04..76c04c51 100644
--- a/orchestrator/live_mode.py
+++ b/orchestrator/live_mode.py
@@ -1,5 +1,4 @@
 import asyncio
-import json
 import logging
 from datetime import datetime, timezone
 from typing import List, Optional
@@ -27,7 +26,9 @@ class LiveMode:
         results = []
         for ticker in tickers:
             try:
-                sig = self._orchestrator.get_combined_signal(ticker, date)
+                sig = await asyncio.to_thread(
+                    self._orchestrator.get_combined_signal, ticker, date
+                )
                 results.append({
                     "ticker": ticker,
                     "date": date,
diff --git a/orchestrator/signals.py b/orchestrator/signals.py
index 1ccecaa3..0715409d 100644
--- a/orchestrator/signals.py
+++ b/orchestrator/signals.py
@@ -52,8 +52,6 @@ class SignalMerger:
 
         # 只有 LLM（quant 失败）
         if quant is None:
-            if llm is None:
-                raise ValueError("llm signal is None when quant is None")
             return FinalSignal(
                 ticker=ticker,
                 direction=llm.direction,
diff --git a/web_dashboard/backend/main.py b/web_dashboard/backend/main.py
index 229b2852..e27d2671 100644
--- a/web_dashboard/backend/main.py
+++ b/web_dashboard/backend/main.py
@@ -363,7 +363,7 @@ async def start_analysis(request: AnalysisRequest, api_key: Optional[str] = Head
             # Use clean environment - don't inherit parent env
             clean_env = {k: v for k, v in os.environ.items()
                         if not k.startswith(("PYTHON", "CONDA", "VIRTUAL"))}
-            clean_env["ANTHROPIC_API_KEY"] = api_key
+            clean_env["ANTHROPIC_API_KEY"] = anthropic_key
             clean_env["ANTHROPIC_BASE_URL"] = "https://api.minimaxi.com/anthropic"
 
             proc = await asyncio.create_subprocess_exec(
@@ -1103,6 +1103,18 @@ async def root():
 @app.websocket("/ws/orchestrator")
 async def ws_orchestrator(websocket: WebSocket):
     """WebSocket endpoint for orchestrator live signals."""
+    import sys
+    sys.path.insert(0, str(REPO_ROOT))
+    from orchestrator.config import OrchestratorConfig
+    from orchestrator.orchestrator import TradingOrchestrator
+    from orchestrator.live_mode import LiveMode
+
+    config = OrchestratorConfig(
+        quant_backtest_path=os.environ.get("QUANT_BACKTEST_PATH", ""),
+    )
+    orchestrator = TradingOrchestrator(config)
+    live = LiveMode(orchestrator)
+
     await websocket.accept()
     try:
         while True:
@@ -1111,18 +1123,6 @@ async def ws_orchestrator(websocket: WebSocket):
             tickers = payload.get("tickers", [])
             date = payload.get("date")
 
-            # Lazy import to avoid loading heavy deps at startup
-            import sys
-            sys.path.insert(0, str(REPO_ROOT))
-            from orchestrator.config import OrchestratorConfig
-            from orchestrator.orchestrator import TradingOrchestrator
-            from orchestrator.live_mode import LiveMode
-
-            config = OrchestratorConfig(
-                quant_backtest_path=os.environ.get("QUANT_BACKTEST_PATH", ""),
-            )
-            orchestrator = TradingOrchestrator(config)
-            live = LiveMode(orchestrator)
             results = await live.run_once(tickers, date)
             await websocket.send_text(json.dumps({"signals": results}))
     except WebSocketDisconnect: