diff --git a/trinity/common/models/vllm_async_model.py b/trinity/common/models/vllm_async_model.py
index 27faa4c44a..177e0e1a81 100644
--- a/trinity/common/models/vllm_async_model.py
+++ b/trinity/common/models/vllm_async_model.py
@@ -100,6 +100,7 @@ def __init__(
             self.action_mask_method = tokenize_and_mask_messages_default
         else:
             self.action_mask_method = tokenize_and_mask_messages_hf
+        self.state_dict_meta = None
         self.ckp_version = 0  # TODO: resume the value from the checkpoint
         self.api_server_host = None
         self.api_server_port = None
@@ -264,9 +265,11 @@ async def _collective_rpc(
                 method, timeout, args, kwargs
             )
 
-    async def sync_model(self, update_weight_args_list) -> bool:
+    async def sync_model(self, update_weight_args_list: Optional[List[Tuple]] = None) -> bool:
         """Sync model weights to vLLM."""
-        for args in update_weight_args_list:
+        if self.state_dict_meta is None:
+            self.state_dict_meta = update_weight_args_list
+        for args in self.state_dict_meta:
             await self._collective_rpc("update_weight", args=args)
         self.logger.info("Sync model weights to vLLM successfully.")
         self.ckp_version += 1
@@ -282,7 +285,9 @@ async def init_process_group(
         backend: str = "nccl",
         timeout: int = 1200,
         update_with_checkpoint: bool = True,
+        state_dict_meta: dict = None,
     ):
+        self.state_dict_meta = state_dict_meta
         return await self._collective_rpc(
             "init_process_group",
             args=(
diff --git a/trinity/common/models/vllm_model.py b/trinity/common/models/vllm_model.py
index 9459cd7511..c999a61bfa 100644
--- a/trinity/common/models/vllm_model.py
+++ b/trinity/common/models/vllm_model.py
@@ -8,7 +8,7 @@
 import os
 import re
 import threading
-from typing import List
+from typing import List, Optional, Tuple
 
 import torch
 import vllm
@@ -85,6 +85,7 @@ def __init__(self, config: InferenceModelConfig):
         else:
             self.action_mask_method = tokenize_and_mask_messages_hf
         self.lock = threading.Lock()
+        self.state_dict_meta = None
         self.ckp_version = 0  # TODO: resume the value from the checkpoint
 
     def init_process_group(
@@ -97,7 +98,9 @@ def init_process_group(
         backend: str = "nccl",
         timeout: int = 1200,
         update_with_checkpoint: bool = True,
+        state_dict_meta: dict = None,
     ):
+        self.state_dict_meta = state_dict_meta
         return self.llm.collective_rpc(
             "init_process_group",
             args=(
@@ -274,10 +277,12 @@ def convert_messages_to_experience(self, messages: List[dict]) -> Experience:
     def has_api_server(self) -> bool:
         return False
 
-    def sync_model(self, update_weight_args_list) -> bool:
+    def sync_model(self, update_weight_args_list: Optional[List[Tuple]] = None) -> bool:
         """Sync model weights to vLLM."""
+        if self.state_dict_meta is None:
+            self.state_dict_meta = update_weight_args_list
         with self.lock:
-            for args in update_weight_args_list:
+            for args in self.state_dict_meta:
                 self.llm.collective_rpc("update_weight", args=args)
         self.logger.info("Sync model weights to vLLM successfully.")
         self.ckp_version += 1
diff --git a/trinity/explorer/explorer.py b/trinity/explorer/explorer.py
index 87657c9b42..26ee0b53c2 100644
--- a/trinity/explorer/explorer.py
+++ b/trinity/explorer/explorer.py
@@ -96,6 +96,7 @@ def setup_weight_sync_group(
                 group_name=ROLLOUT_WEIGHT_SYNC_GROUP_NAME,
                 timeout=self.config.synchronizer.sync_timeout,
                 update_with_checkpoint=self.use_checkpoint_weights_update,
+                state_dict_meta=state_dict_meta,
             )
             for i, model in enumerate(self.models)
         ]
@@ -119,9 +120,13 @@ def _init_runner_pool(self) -> RunnerPool:
     def _update_model_weight(self, state_dict: dict) -> None:
         # TODO: update model weight
         self.state_dict = state_dict
-        update_weight_args_list = []
-        for name, param in state_dict.items():
-            update_weight_args_list.append((name, str(param.dtype), tuple(param.shape)))
+        if self.state_dict_meta is None:
+            update_weight_args_list = []
+            for name, param in state_dict.items():
+                update_weight_args_list.append((name, str(param.dtype), tuple(param.shape)))
+            self.state_dict_meta = update_weight_args_list
+        else:
+            update_weight_args_list = None
         ray.get([model.sync_model.remote(update_weight_args_list) for model in self.models])
         self.state_dict.clear()
 
@@ -142,7 +147,8 @@ def _checkpoint_weights_update(self, step_num: Optional[int] = None) -> None:
             self.logger.error(f"Error when loading state_dict: {e}")
 
     def _nccl_weights_update(self):
-        ray.get([model.sync_model.remote(self.state_dict_meta) for model in self.models])
+        assert self.state_dict_meta is not None
+        ray.get([model.sync_model.remote() for model in self.models])
 
     def prepare(self) -> None:
         """Preparation before running."""