diff --git a/fastdeploy/worker/gcu_model_runner.py b/fastdeploy/worker/gcu_model_runner.py
index 433ec85cb..26522044f 100644
--- a/fastdeploy/worker/gcu_model_runner.py
+++ b/fastdeploy/worker/gcu_model_runner.py
@@ -576,8 +576,9 @@ class GCUModelRunner(ModelRunnerBase):
         )
 
         # Update Batch type for cuda graph
-        is_decode_batch = not ((self.share_inputs["seq_lens_this_time"] > 1).sum() > 0)
-        self.forward_meta.step_use_cudagraph = self.use_cudagraph and is_decode_batch
+        self.forward_meta.step_use_cudagraph = self.use_cudagraph and (
+            not ((self.share_inputs["seq_lens_this_time"] > 1).sum() > 0)
+        )
 
         # Initialzie attention meta data
         for attn_backend in self.attn_backends:
diff --git a/fastdeploy/worker/gpu_model_runner.py b/fastdeploy/worker/gpu_model_runner.py
index 0be973530..3f9014dc2 100644
--- a/fastdeploy/worker/gpu_model_runner.py
+++ b/fastdeploy/worker/gpu_model_runner.py
@@ -793,16 +793,21 @@ class GPUModelRunner(ModelRunnerBase):
 
         # Update Batch type for cuda graph
         # TODO(gongshaotian): Use seq_lens_encoder to set is_decode_batch
-        is_decode_batch = not ((self.share_inputs["seq_lens_this_time"] > 1).sum() > 0)
-
+        only_decode_batch = True
+        prefill_exists = None
         # mix ep in single node
         if self.fd_config.parallel_config.use_ep and self.fd_config.parallel_config.splitwise_role == "mixed":
-            is_decode_batch_list = []
-            paddle.distributed.all_gather_object(is_decode_batch_list, is_decode_batch)
-            is_decode_batch = all(is_decode_batch_list)
-            self.fd_config.parallel_config.moe_phase.phase = "decode" if is_decode_batch else "prefill"
+            only_decode_batch_list = []
+            prefill_exists = self.exist_prefill()
+            paddle.distributed.all_gather_object(only_decode_batch_list, not prefill_exists)
+            only_decode_batch = all(only_decode_batch_list)
+            self.fd_config.parallel_config.moe_phase.phase = "decode" if only_decode_batch else "prefill"
 
-        self.forward_meta.step_use_cudagraph = self.use_cudagraph and is_decode_batch
+        self.forward_meta.step_use_cudagraph = (
+            self.use_cudagraph
+            and only_decode_batch
+            and not (prefill_exists if prefill_exists is not None else self.exist_prefill())
+        )
 
         # Initialzie attention meta data
         for attn_backend in self.attn_backends: