diff --git a/mindspore/ccsrc/debug/data_dump/npy_header.cc b/mindspore/ccsrc/debug/data_dump/npy_header.cc
index def70dc6b61..6f4e42e9e14 100644
--- a/mindspore/ccsrc/debug/data_dump/npy_header.cc
+++ b/mindspore/ccsrc/debug/data_dump/npy_header.cc
@@ -113,7 +113,7 @@ void int_to_byte(size_t number, char *byte, size_t length) {
 std::string GenerateNpyHeader(const ShapeVector &shape, TypeId type_id, bool fortran_order) {
   auto type_desc = type_desc_map.find(type_id);
   if (type_desc == type_desc_map.end()) {
-    MS_LOG(WARNING) << "Not support dump the " << TypeIdToType(type_id)->ToString() << " data to npy file.";
+    MS_LOG(INFO) << "Not support dump the " << TypeIdToType(type_id)->ToString() << " data to npy file.";
     return std::string();
   }
 
diff --git a/mindspore/ccsrc/debug/debug_services.cc b/mindspore/ccsrc/debug/debug_services.cc
index ef0654d93bb..de6330e63a1 100644
--- a/mindspore/ccsrc/debug/debug_services.cc
+++ b/mindspore/ccsrc/debug/debug_services.cc
@@ -636,16 +636,22 @@ void DebugServices::AddToTensorData(const std::string &backend_name, const std::
 
 void DebugServices::SetPrefixToCheck(std::string *prefix_dump_file_name, std::string *dump_style_kernel_name,
                                      size_t slot) {
+  std::string dump_style_name_part = *dump_style_kernel_name;
+  std::size_t last_scope_marker;
+  std::string delim;
   if (is_sync_mode) {
-    std::string dump_style_name_part = *dump_style_kernel_name;
-    std::size_t last_scope_marker = dump_style_kernel_name->rfind("--");
-    if (last_scope_marker != std::string::npos) {
-      dump_style_name_part = dump_style_kernel_name->substr(last_scope_marker + 2);
-    }
-    *prefix_dump_file_name = dump_style_name_part + ".output." + std::to_string(slot);
+    delim = "--";
   } else {
-    *prefix_dump_file_name = *dump_style_kernel_name;
+    delim = "_";
   }
+  last_scope_marker = dump_style_kernel_name->rfind(delim);
+  if (last_scope_marker != std::string::npos) {
+    dump_style_name_part = dump_style_kernel_name->substr(last_scope_marker + delim.size());
+  }
+  if (is_sync_mode) {
+    dump_style_name_part += ".output." + std::to_string(slot);
+  }
+  *prefix_dump_file_name = dump_style_name_part;
 }
 
 void DebugServices::ReadDumpedTensor(std::vector<std::string> backend_name, std::vector<size_t> slot,
@@ -728,10 +734,7 @@ void DebugServices::ReadDumpedTensor(std::vector<std::string> backend_name, std:
       bool found = false;
       // if async mode
       for (const std::string &file_path : async_file_pool) {
-        size_t first_dot_pos = file_path.find('.');
-        size_t second_dot_pos = file_path.find('.', first_dot_pos + 1);
-        std::string file_path_op_name = file_path.substr(first_dot_pos + 1, second_dot_pos - first_dot_pos - 1);
-        if (file_path_op_name == prefix_dump_file_name &&
+        if (file_path.find(prefix_dump_file_name) != std::string::npos &&
             file_path.find(".output." + std::to_string(slot[i])) != std::string::npos) {
           found = true;
           shape.clear();
@@ -761,8 +764,8 @@ std::string DebugServices::GetStrippedFilename(const std::string &file_name) {
 
   // Look for the second dot's position from the back to avoid issue due to dots in the node name.
   size_t second_dot = fifth_dot;
-  const int8_t kSeconeDotPosition = 2;
-  for (int8_t pos = 5; pos > kSeconeDotPosition; pos--) {
+  const int8_t kSecondDotPosition = 2;
+  for (int8_t pos = 5; pos > kSecondDotPosition; pos--) {
     second_dot = file_name.rfind(".", second_dot - 1);
   }
 
diff --git a/mindspore/offline_debug/mi_validator_helpers.py b/mindspore/offline_debug/mi_validator_helpers.py
index abc4b38223f..643626fbbe0 100644
--- a/mindspore/offline_debug/mi_validator_helpers.py
+++ b/mindspore/offline_debug/mi_validator_helpers.py
@@ -48,6 +48,11 @@ def check_uint64(arg, arg_name=""):
     check_value(arg, [UINT64_MIN, UINT64_MAX])
 
 
+def check_iteration(arg, arg_name=""):
+    type_check(arg, (int,), arg_name)
+    check_value(arg, [-1, UINT64_MAX])
+
+
 def check_dir(dataset_dir):
     if not os.path.isdir(dataset_dir) or not os.access(dataset_dir, os.R_OK):
         raise ValueError("The folder {} does not exist or permission denied!".format(dataset_dir))
diff --git a/mindspore/offline_debug/mi_validators.py b/mindspore/offline_debug/mi_validators.py
index 669c99be774..8c48416a6f2 100644
--- a/mindspore/offline_debug/mi_validators.py
+++ b/mindspore/offline_debug/mi_validators.py
@@ -18,7 +18,7 @@ Validator Functions for Offline Debugger APIs.
 from functools import wraps
 
 import mindspore.offline_debug.dbg_services as cds
-from mindspore.offline_debug.mi_validator_helpers import parse_user_args, type_check, type_check_list, check_dir, check_uint32, check_uint64
+from mindspore.offline_debug.mi_validator_helpers import parse_user_args, type_check, type_check_list, check_dir, check_uint32, check_uint64, check_iteration
 
 
 def check_init(method):
@@ -114,7 +114,7 @@ def check_check_watchpoints(method):
     def new_method(self, *args, **kwargs):
         [iteration], _ = parse_user_args(method, *args, **kwargs)
 
-        check_uint32(iteration, "iteration")
+        check_iteration(iteration, "iteration")
 
         return method(self, *args, **kwargs)
 
@@ -159,7 +159,7 @@ def check_tensor_info_init(method):
 
         type_check(node_name, (str,), "node_name")
         check_uint32(slot, "slot")
-        check_uint32(iteration, "iteration")
+        check_iteration(iteration, "iteration")
         check_uint32(device_id, "device_id")
         check_uint32(root_graph_id, "root_graph_id")
         type_check(is_parameter, (bool,), "is_parameter")