diff --git a/csst_common/data_manager.py b/csst_common/data_manager.py
index 0d8c4c1221eccd500da1e815364b8e60ddc096ec..59d361ca587cff0ef102f1edb7fe821a22b2188f 100644
--- a/csst_common/data_manager.py
+++ b/csst_common/data_manager.py
@@ -156,8 +156,8 @@ class CsstMsDataManager:
                  _survey: str = "MS",
                  obs_type: str = "SCI",
                  l0_post: str = "L0_1",
-                 log_ppl=None,
-                 log_mod=None,
+                 log_ppl="",
+                 log_mod="",
                  clear_dir=False,
                  verbose=True,
                  n_jobs=18,
@@ -238,15 +238,15 @@ class CsstMsDataManager:
             self.clear_dir(self.dir_l1)
 
         # pipeline logger
-        if log_ppl is not None:
+        if log_ppl == "":
+            self.logger_ppl = get_logger(name="CSST L1 Pipeline Logger", filename="")
+        else:
             self.logger_ppl = get_logger(name="CSST L1 Pipeline Logger", filename=os.path.join(dir_l1, log_ppl))
-            if verbose:
-                self.logger_ppl.info("logger_ppl initialized")
         # module logger
-        if log_mod is not None:
+        if log_mod == "":
+            self.logger_mod = get_logger(name="CSST L1 Module Logger", filename="")
+        else:
             self.logger_mod = get_logger(name="CSST L1 Module Logger", filename=os.path.join(dir_l1, log_mod))
-            if verbose:
-                self.logger_mod.info("logger_mod initialized")
 
         self.custom_bias = None
         self.custom_dark = None