diff --git a/ktransformers/local_chat.py b/ktransformers/local_chat.py
index 4e006b6..676ea67 100644
--- a/ktransformers/local_chat.py
+++ b/ktransformers/local_chat.py
@@ -160,7 +160,7 @@ def local_chat(
             messages, add_generation_prompt=True, return_tensors="pt"
         )
         if force_think:
-            token_thinks = torch.tensor([tokenizer.encode("<think>\\n",add_special_tokens=False)])
+            token_thinks = torch.tensor([tokenizer.encode("<think>\\n",add_special_tokens=False)],device=input_tensor.device)
             input_tensor = torch.cat(
                 [input_tensor, token_thinks], dim=1
             )
diff --git a/ktransformers/server/args.py b/ktransformers/server/args.py
index e90ca2f..44fe7d2 100644
--- a/ktransformers/server/args.py
+++ b/ktransformers/server/args.py
@@ -122,4 +122,5 @@ class ArgumentParser:
         self.cfg.server_ip = args.host
         self.cfg.server_port = args.port
         self.cfg.backend_type = args.type
+        self.cfg.user_force_think = args.force_think
         return args
diff --git a/ktransformers/server/backend/interfaces/transformers.py b/ktransformers/server/backend/interfaces/transformers.py
index 01a6b84..f18581a 100644
--- a/ktransformers/server/backend/interfaces/transformers.py
+++ b/ktransformers/server/backend/interfaces/transformers.py
@@ -325,7 +325,7 @@ class TransformersInterface(BackendInterfaceBase):
         else:
             raise ValueError("local_messages should be List or str")
         if Config().user_force_think:
-            token_thinks = torch.tensor([self.tokenizer.encode("<think>\\n",add_special_tokens=False)])
+            token_thinks = torch.tensor([self.tokenizer.encode("<think>\\n",add_special_tokens=False)],device=input_ids.device)
             input_ids = torch.cat(
                 [input_ids, token_thinks], dim=1
             )
@@ -334,8 +334,9 @@ class TransformersInterface(BackendInterfaceBase):
 
         self.profiler.create_and_start_timer("prefill")
         if Config().user_force_think:
-            print("<think>\n")
-            yield "<think>\n"
+            t = "<think>\n"
+            print(t,end="",flush=True)
+            yield t
         for t in self.prefill(input_ids, self.check_is_new(thread_id)):
             if t is not None:
                 print(t, end="",flush=True)
@@ -346,7 +347,7 @@ class TransformersInterface(BackendInterfaceBase):
         for t in self.generate():
             if t is not None:
                 print(t, end="",flush=True)
-                yield t
+                yield t 
         print("")
         self.profiler.pause_timer("decode")
         self.report_last_time_performance()