diff --git a/tf_adapter/python/npu_bridge/estimator/npu/npu_scope.py b/tf_adapter/python/npu_bridge/estimator/npu/npu_scope.py
index 20547f5879dadb73794dbd8b359c2619b3591c90..d85e373d46edd0ddddc9b5d85104df938af19341 100644
--- a/tf_adapter/python/npu_bridge/estimator/npu/npu_scope.py
+++ b/tf_adapter/python/npu_bridge/estimator/npu/npu_scope.py
@@ -223,16 +223,16 @@ def disable_autofuse():
 @contextlib.contextmanager
 def limit_core_num_scope(op_aicore_num="0", op_vectorore_num="0"):
     """
-    Limit the aic abd aiv core num of autofuse operators within the scope.
+    Limit the aic and aiv core num of autofuse operators within the scope, only support aiv core num now.
     """
     if not isinstance(op_vectorore_num, str):
         raise ValueError("Param op_vectorore_num must be string.")
     try:
         int_vector_core_num = int(op_vectorore_num)
     except ValueError:
-        raise ValueError("Param op_vectorore_num can not be translated into a valid int number.")
-    if not (0 < int_vector_core_num < 48):
-        raise ValueError("Param op_vectorore_num must be in a valid range.")
+        raise ValueError("Param op_vectorore_num can not be converted into a valid int number.")
+    if int_vector_core_num <= 0:
+        raise ValueError("Param op_vectorore_num must be greater than zero.")
     attrs = {
         "_op_vectorcore_num": attr_value_pb2.AttrValue(s=compat.as_bytes(op_vectorore_num))
     }