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 38aa20d..44fe7d2 100644
--- a/ktransformers/server/args.py
+++ b/ktransformers/server/args.py
@@ -90,6 +90,7 @@ class ArgumentParser:
         # user config
         parser.add_argument("--user_secret_key", type=str, default=self.cfg.user_secret_key)
         parser.add_argument("--user_algorithm", type=str, default=self.cfg.user_algorithm)
+        parser.add_argument("--force_think", type=bool, default=self.cfg.user_force_think)
 
         # web config
         parser.add_argument("--web_cross_domain", type=bool, default=self.cfg.web_cross_domain)
@@ -121,4 +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 81fa6e5..f18581a 100644
--- a/ktransformers/server/backend/interfaces/transformers.py
+++ b/ktransformers/server/backend/interfaces/transformers.py
@@ -10,6 +10,7 @@ from transformers import (
     BitsAndBytesConfig,
 )
 
+from ktransformers.server.config.config import Config
 from ktransformers.server.schemas.base import ObjectID
 from ktransformers.server.utils.multi_timer import Profiler
 import torch
@@ -323,10 +324,19 @@ class TransformersInterface(BackendInterfaceBase):
             #input_ids = torch.tensor([[6366]], device=input_ids.device)
         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)],device=input_ids.device)
+            input_ids = torch.cat(
+                [input_ids, token_thinks], dim=1
+            )
 
         self.profiler.pause_timer("tokenize")
 
         self.profiler.create_and_start_timer("prefill")
+        if Config().user_force_think:
+            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)
@@ -337,7 +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()
diff --git a/ktransformers/server/config/config.py b/ktransformers/server/config/config.py
index 7ce616b..7dc9921 100644
--- a/ktransformers/server/config/config.py
+++ b/ktransformers/server/config/config.py
@@ -83,6 +83,7 @@ class Config(metaclass=Singleton):
         self.user_config: dict = cfg.get("user", {})
         self.user_secret_key = self.user_config.get("secret_key", "")
         self.user_algorithm = self.user_config.get("algorithm", "")
+        self.user_force_think = self.user_config.get("force_think", False)
 
         # model config
         self.model: dict = cfg.get("model", {})