diff --git a/debug/accuracy_tools/msprobe/core/common_config.py b/debug/accuracy_tools/msprobe/core/common_config.py
index 1479a018e5281adf2ddcd8a916fbc299acc6f784..da95b138c157063a521ec3d83c2a64208dde67cf 100644
--- a/debug/accuracy_tools/msprobe/core/common_config.py
+++ b/debug/accuracy_tools/msprobe/core/common_config.py
@@ -36,7 +36,8 @@ class CommonConfig:
                                    f'For the hyphen(-) in step, the left boundary ({borderline[0]}) cannot be greater than the right boundary ({borderline[1]}).')
         return continual_step
 
-    def get_real_step(self, step_input):
+    @classmethod
+    def get_real_step(cls, step_input):
         if step_input is None:
             return []
         if not isinstance(step_input, list):
@@ -49,7 +50,7 @@ class CommonConfig:
             if isinstance(step, int) and step >= 0:
                 real_step.append(step)
             elif isinstance(step, str) and '-' in step:
-                continual_step = self.get_step_from_string(step)
+                continual_step = cls.get_step_from_string(step)
                 real_step.extend(continual_step)
         real_step = list(set(real_step))
         real_step.sort()
diff --git a/debug/accuracy_tools/msprobe/pytorch/debugger/precision_debugger.py b/debug/accuracy_tools/msprobe/pytorch/debugger/precision_debugger.py
index 5c11f493125b9cc85cff9523e6da3903f89cdec5..54c79d6a66008594f8c23417988fa3c4013e8956 100644
--- a/debug/accuracy_tools/msprobe/pytorch/debugger/precision_debugger.py
+++ b/debug/accuracy_tools/msprobe/pytorch/debugger/precision_debugger.py
@@ -4,6 +4,7 @@ import torch
 from msprobe.core.common.const import Const, FileCheckConst
 from msprobe.core.common.exceptions import MsprobeException
 from msprobe.core.common.file_utils import FileChecker
+from msprobe.core.common_config import CommonConfig
 from msprobe.pytorch.common.log import logger
 from msprobe.pytorch.debugger.debugger_config import DebuggerConfig
 from msprobe.pytorch.grad_probe.grad_monitor import GradientMonitor
@@ -52,7 +53,7 @@ class PrecisionDebugger:
                 self.gm = GradientMonitor(common_config, task_config)
                 return
             if step:
-                common_config.step = step
+                common_config.step = CommonConfig.get_real_step(step)
             self.config = DebuggerConfig(
                 common_config, task_config, task, dump_path, level
             )