diff --git a/csst_mci_sim/earthshine.py b/csst_mci_sim/earthshine.py
index bee2b128e16b2b5df20e17958784a558f0e142ae..332aa4e0f112e66b6f6562b2bdd92e449507084c 100644
--- a/csst_mci_sim/earthshine.py
+++ b/csst_mci_sim/earthshine.py
@@ -57,7 +57,7 @@ def ill2flux(E, path):
 
     # use template from sky_bkg (background_spec_hst.dat)
     filename = path+'MCI_inputData/refs/background_spec_hst.dat'
-    cat_spec = pd.read_csv(filename, sep='\s+', header=None, comment='#')
+    cat_spec = pd.read_csv(filename, sep='\\s+', header=None, comment='#')
     wave0 = cat_spec[0].values       # A
     spec0 = cat_spec[2].values      # erg/s/cm^2/A/arcsec^2
 
diff --git a/csst_mci_sim/straylight.py b/csst_mci_sim/straylight.py
index cb37588ccabd777a8b991bb6a5ad11bc0a67992f..2646f5de9d2589ce119b38e9cad3174fafef2722 100644
--- a/csst_mci_sim/straylight.py
+++ b/csst_mci_sim/straylight.py
@@ -57,7 +57,7 @@ def ill2flux(E, path):
 
     # use template from sky_bkg (background_spec_hst.dat)
     filename = path+'MCI_inputData/refs/background_spec_hst.dat'
-    cat_spec = pd.read_csv(filename, sep='\s+', header=None, comment='#')
+    cat_spec = pd.read_csv(filename, sep='\\s+', header=None, comment='#')
     wave0 = cat_spec[0].values       # A
     spec0 = cat_spec[2].values      # erg/s/cm^2/A/arcsec^2
 
diff --git a/csst_mci_sim/support/cosmicrays.py b/csst_mci_sim/support/cosmicrays.py
index c54edbb59db915c7d4b5a6d5da2a7be3cb1be465..49ceba87b68d2979ea04a85426d9f540f0ae7949 100644
--- a/csst_mci_sim/support/cosmicrays.py
+++ b/csst_mci_sim/support/cosmicrays.py
@@ -48,7 +48,7 @@ class cosmicrays():
 
         self.log = log
 
-        #image and size
+        # image and size
         self.image = image.copy()
         self.ysize, self.xsize = self.image.shape
 
@@ -180,9 +180,7 @@ class cosmicrays():
         return crImage
 ##################################################
 ############################################
-############################################################################
-#####################################
-########################################
+
     def _drawEventsToCoveringFactor(self, coveringFraction=3.0, limit=1000, verbose=False):
         """
         Generate cosmic ray events up to a covering fraction and include it to a cosmic ray map (self.cosmicrayMap).
diff --git a/csst_mci_sim/support/sed.py b/csst_mci_sim/support/sed.py
index 1e14fa55c25dcec76f89e3786a9c90ed5cf1e186..fb1fa2b5acf42c26bbe82566548dd1bf1b07c3b5 100755
--- a/csst_mci_sim/support/sed.py
+++ b/csst_mci_sim/support/sed.py
@@ -217,7 +217,7 @@ def Model_Galaxy_SED(wave, ugriz, z, temp, path):
         temp (class): Class of gaalxy template
 
     Returns:
-        float array: Spectral energy distribution of stellar SED, 
+        float array: Spectral energy distribution of stellar SED,
         which have the same length to the input wave
     """
     sed = 10. ** (-0.4 * ugriz)
diff --git a/csst_mci_sim/support/shao.py b/csst_mci_sim/support/shao.py
index 320def7139225e4811ac07aef476c893aede08b6..d6f8185808752dedcec781f20dc77f53bf425d18 100644
--- a/csst_mci_sim/support/shao.py
+++ b/csst_mci_sim/support/shao.py
@@ -1,8 +1,9 @@
 from ctypes import *
 
+
 def checkInputList(input_list, n):
     if not isinstance(type(input_list), list):
-    # if type(input_list) != type([1, 2, 3]):
+        # if type(input_list) != type([1, 2, 3]):
         raise TypeError("Input type is not list!", input_list)
     for i in input_list:
         if not isinstance(type(i), float):      # type(i) != type(1.1):
@@ -49,7 +50,8 @@ def onOrbitObsPosition(path, input_ra_list, input_dec_list, input_pmra_list, inp
     input_vy = input_vy*1000.0
     input_vz = input_vz*1000.0
 
-    if not isinstance(type(input_date_str), str): # type(input_date_str) != type("2025-03-05"):
+    if not isinstance(type(input_date_str), str):   
+        # type(input_date_str) != type("2025-03-05"):
         raise TypeError("Parameter 15 is not string!", input_date_str)
     else:
         input_date_str = input_date_str.strip()
@@ -73,7 +75,8 @@ def onOrbitObsPosition(path, input_ra_list, input_dec_list, input_pmra_list, inp
                 raise TypeError(
                     "Parameter 15 day range error [1 ~ 31]!", input_day)
 
-    if not isinstance(type(input_time_str), str): # type(input_time_str) != type("20:15:15.15"):
+    if not isinstance(type(input_time_str), str): 
+        # type(input_time_str) != type("20:15:15.15"):
         raise TypeError("Parameter 16 is not string!", input_time_str)
     else:
         input_time_str = input_time_str.strip()