diff --git a/utils/engine.py b/utils/engine.py
index ebfb697..9812141 100644
--- a/utils/engine.py
+++ b/utils/engine.py
@@ -88,6 +88,7 @@ def __init__(self, config: InferenceConfig, context=None,callback=None):
         self.exit_flag = False
         self.max_batch = config.max_batch
         self.kv_cache_length = config.kv_cache_length
+        self.max_prefill_length = config.max_prefill_length
         # kv_cache的长度和max_output_length的长度一样
         self.past_kv_size=self.kv_cache_length
         self.input_pos = 0
@@ -130,9 +131,9 @@ def get_inputs(self, seq_len: int) -> List[np.ndarray]:
             self.num_hidden_layers * 2 * self.num_key_value_heads,
             self.per_head_dim
         )
-        """ 
+        """
         temp_seq_len = self.real_kv_size + seq_len
-        if temp_seq_len <= self.kv_cache_length // 2:
+        if self.max_prefill_length > 1 and temp_seq_len <= self.kv_cache_length // 2:
             temp_kv_size = self.kv_cache_length // 2
         else:
             temp_kv_size = self.kv_cache_length