diff --git a/ObservationSim/Config/Header/ImageHeader.py b/ObservationSim/Config/Header/ImageHeader.py
index 4a78f2880a08e8df50131037baef707eafdd34f3..14d8ea84525bb3c5a4f86ae64cb856fec28b3928 100644
--- a/ObservationSim/Config/Header/ImageHeader.py
+++ b/ObservationSim/Config/Header/ImageHeader.py
@@ -259,7 +259,7 @@ def generatePrimaryHeader(xlen = 9216, ylen = 9232, pointNum = '1', ra = 60, dec
 
     h_prim['PIXSIZE1'] = xlen
     h_prim['PIXSIZE2'] = ylen
-    h_prim['FILENAME'] = 'MSC_' + im_type + '_' + date + time_obs + '_1' + pointNum.rjust(8,'0') + '_' +CCDID[k-1].rjust(2,'0')+'_raw'
+
     h_prim['DATE'] = '20'+date[0:2]+'-' + date[2:4]+'-'+date[4:6]
     h_prim['TIME'] = time_obs[0:2]+':'+time_obs[2:4]+':'+time_obs[4:6]
     h_prim['DATE-OBS'] = '20'+date[0:2]+'-' + date[2:4]+'-'+date[4:6]
@@ -273,7 +273,7 @@ def generatePrimaryHeader(xlen = 9216, ylen = 9232, pointNum = '1', ra = 60, dec
     h_prim['EXPTIME'] = exptime
     
     # Define file types
-    file_type = {'MS':'sci', 'CLB':'zero', 'CLD':'dark', 'CLF':'flat', 'CRS':'cosmic_ray', 'CRD':'cosmic_ray'}
+    file_type = {'MS':'sci', 'BIAS':'zero', 'DARK':'dark', 'FLAT':'flat', 'CRS':'cosmic_ray', 'CRD':'cosmic_ray'}
     h_prim['FILETYPE'] = file_type[im_type]
 
     co = coord.SkyCoord(ra, dec, unit='deg')
@@ -294,6 +294,12 @@ def generatePrimaryHeader(xlen = 9216, ylen = 9232, pointNum = '1', ra = 60, dec
     tend = Time(tstart.mjd + h_prim['EXPTIME']/86400., format="mjd")
     h_prim['EXPEND'] = round(tend.mjd, 5)
 
+    file_start_time = '20' + date[0:6] + time_obs[0:6]
+    end_time_str = str(tend.datetime)
+    file_end_time = end_time_str[0:4] + end_time_str[5:7]+end_time_str[8:10] + end_time_str[11:13] + end_time_str[14:16] + end_time_str[17:19]
+    h_prim['FILENAME'] = 'CSST_MSC_MS_' + im_type + '_' + file_start_time + '_' + file_end_time + '_1' + pointNum.rjust(8, '0') + '_' + CCDID[
+        k - 1].rjust(2, '0') + '_L0_1'
+
 
     h_prim['POSI0_X'] = sat_pos[0]
     h_prim['POSI0_Y'] = sat_pos[1]
diff --git a/ObservationSim/Instrument/Chip/Chip.py b/ObservationSim/Instrument/Chip/Chip.py
index 5c6aea744acecfbb523135098cd28c05fdb0e9ab..4dcc7a006066967a63932e8e4a64d96b74b425e9 100755
--- a/ObservationSim/Instrument/Chip/Chip.py
+++ b/ObservationSim/Instrument/Chip/Chip.py
@@ -360,7 +360,7 @@ class Chip(FocalPlane):
             cr_map, cr_event_num = effects.produceCR_Map(
                 xLen=self.npix_x, yLen=self.npix_y, 
                 exTime=self.exptime+0.5*self.readout_time, 
-                cr_pixelRatio=0.003*(self.exptime+0.5*self.readout_time)/150., 
+                cr_pixelRatio=0.003*(self.exptime+0.5*self.readout_time)/600.,
                 gain=self.gain, 
                 attachedSizes=self.attachedSizes,
                 seed=SeedCosmicRay+pointing_ID*30+self.chipID)   # seed: obj-imaging:+0; bias:+1; dark:+2; flat:+3;
@@ -511,7 +511,7 @@ class Chip(FocalPlane):
                     ra_cen=ra_cen,
                     dec_cen=dec_cen,
                     img_rot=img_rot,
-                    im_type='CLB',
+                    im_type='BIAS',
                     pointing_ID=pointing_ID,
                     date_obs=date_obs,
                     time_obs=time_obs,
@@ -603,7 +603,7 @@ class Chip(FocalPlane):
                     ra_cen=ra_cen,
                     dec_cen=dec_cen,
                     img_rot=img_rot,
-                    im_type='CLF',
+                    im_type='FLAT',
                     pointing_ID=pointing_ID,
                     date_obs=date_obs,
                     time_obs=time_obs,
@@ -717,7 +717,7 @@ class Chip(FocalPlane):
                     ra_cen=ra_cen,
                     dec_cen=dec_cen,
                     img_rot=img_rot,
-                    im_type='CLD',
+                    im_type='DARK',
                     pointing_ID=pointing_ID,
                     date_obs=date_obs,
                     time_obs=time_obs,
diff --git a/ObservationSim/ObservationSim.py b/ObservationSim/ObservationSim.py
index 60cec67c30869a1b247a02c8f08cdcccb050c675..0ed651d2dc8d48b7234026fb7bdc5fe209d46423 100755
--- a/ObservationSim/ObservationSim.py
+++ b/ObservationSim/ObservationSim.py
@@ -130,8 +130,8 @@ class Observation(object):
             bright_obj = 0
             dim_obj = 0
             for j in range(self.nobj):
-                # if j >= 100:
-                #     break
+                if j >= 1:
+                    break
                 obj = self.cat.objs[j]
                 if obj.type == 'star' and self.config["run_option"]["galaxy_only"]:
                     continue
@@ -273,7 +273,7 @@ class Observation(object):
                 date=date_obs,
                 time_obs=time_obs,
                 exptime=pointing.exp_time,
-                im_type='MS',
+                im_type='SCI',
                 sat_pos=[pointing.sat_x, pointing.sat_y, pointing.sat_z],
                 sat_vel=[pointing.sat_vx, pointing.sat_vy, pointing.sat_vz])
             h_ext = generateExtensionHeader(