diff --git a/app/main.py b/app/main.py
index e57b0d3..7a05788 100644
--- a/app/main.py
+++ b/app/main.py
@@ -185,7 +185,15 @@ def _encode(texts: List[str]):
     """
     def _worker(t, q):
         try:
-            q.put(("ok", model.encode(t, return_dense=True)))
+            if DEVICE.startswith("cuda"):
+                # 正常 GPU 跑，多进程池照旧
+                out = model.encode(t, return_dense=True)
+            else:
+                # 已经 fallback 到 CPU：禁用进程池，禁止再向 GPU 拷权重
+                out = model.encode(t, return_dense=True,
+                                   num_processes=1,
+                                   device="cpu")
+            q.put(("ok", out))
         except Exception as e:
             q.put(("err", str(e)))