diff --git a/.gitignore b/.gitignore
index a15b23809ff014bee59e53f9d0f7cabf62830ef0..1845922d7c86c84658453190839554dd92f753b1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 build/*
-CSSTSim.egg-info/*
+csst_msc_sim.egg-info/*
 dist/*
 *.pyc
 *.so
diff --git a/ObservationSim/Config/Header/ImageHeader.py b/ObservationSim/Config/Header/ImageHeader.py
index 7550c2f1e7c450d7c46286dc0630b34cd460947e..516cd260d95c90d296f922291e01e3e7f111efeb 100644
--- a/ObservationSim/Config/Header/ImageHeader.py
+++ b/ObservationSim/Config/Header/ImageHeader.py
@@ -473,7 +473,7 @@ def generatePrimaryHeader(xlen = 9216, ylen = 9232, pointing_id = '00000001', po
     # h_prim['SIM_VER'] = (get_distribution("CSSTSim").version, "Version of CSST MSC simulation software")
     currentDateAndTime = datetime.now()
     compute_name = platform.node()
-    h_prim['FITSSWV'] = get_distribution("CSSTSim").version +'_' + currentDateAndTime.strftime("%Y%m%d") + '_' +compute_name
+    h_prim['FITSSWV'] = get_distribution("csst_msc_sim").version +'_' + currentDateAndTime.strftime("%Y%m%d") + '_' +compute_name
     h_prim['EPOCH'] = round((Time(h_prim['EXPSTART'], format='mjd', scale='tcb')).jyear, 1)
 
     return h_prim
diff --git a/run_sim.py b/run_sim.py
index 03d8489cf0a4a188ceca6be278c8a88614f60c11..0cc1368633c80a2c84f7a39d4171eb11b6cc5783 100755
--- a/run_sim.py
+++ b/run_sim.py
@@ -10,6 +10,7 @@ import importlib
 import gc
 gc.enable()
 
+
 def run_sim():
     """
     Main method for simulation call.
@@ -18,13 +19,13 @@ def run_sim():
     ----------
     Catalog : Class
         a catalog class which is inherited from ObservationSim.MockObject.CatalogBase 
-    
+
     Returns
     ----------
         None
     """
-    # Get version of CSSTSim Package
-    __version__ = version("CSSTSim")
+    # Get version of the Package
+    __version__ = version("csst_msc_sim")
 
     # Get run datetime
     now = datetime.datetime.now()
@@ -38,7 +39,7 @@ def run_sim():
         try:
             config = yaml.safe_load(stream)
             for key, value in config.items():
-                print (key + " : " + str(value))
+                print(key + " : " + str(value))
         except yaml.YAMLError as exc:
             print(exc)
 
@@ -62,42 +63,48 @@ def run_sim():
     if "run_counter" not in config:
         config["run_counter"] = 0
 
-    # Generate lists pointings based on the input pointing list (or default 
+    # Generate lists pointings based on the input pointing list (or default
     # pointing RA, DEC) and "config["obs_setting"]["run_pointings"]".
-    # "config['obs_setting']['np_cal']"" is the number of CAL pointings which will be 
+    # "config['obs_setting']['np_cal']"" is the number of CAL pointings which will be
     # appended to the front.
     # NOTE: the implementation of gerenating time_stamps is temporary.
     pointing_dir = None
     if "pointing_dir" in config['obs_setting']:
         pointing_dir = config['obs_setting']["pointing_dir"]
-    pointing_list = generate_pointing_list(config=config, pointing_filename=config['obs_setting']['pointing_file'], data_dir=pointing_dir)
+    pointing_list = generate_pointing_list(
+        config=config, pointing_filename=config['obs_setting']['pointing_file'], data_dir=pointing_dir)
 
     # Make the main output directories
-    run_dir = make_run_dirs(work_dir=config['work_dir'], run_name=config['run_name'], pointing_list=pointing_list)
-    
+    run_dir = make_run_dirs(
+        work_dir=config['work_dir'], run_name=config['run_name'], pointing_list=pointing_list)
+
     # Copy the config file to output directory & Write Run metadata
     shutil.copy(args.config_file, run_dir)
     run_meta = os.path.join(run_dir, "run_metadata.yaml")
     with open(run_meta, "w") as config_out:
         config_out.write("\n")
         config_out.write("###############################################\n")
-        config_out.write("CSSTSim_version: \"%s\"\n"%__version__)
+        config_out.write(
+            "csst_msc_sim package version: \"%s\"\n" % __version__)
         date_str = datetime.datetime.strftime(now, '%m/%d/%Y')
         time_str = datetime.datetime.strftime(now, '%H:%M:%S')
-        config_out.write("Run_date: \"%s\"\n"%date_str)
-        config_out.write("Run_time: \"%s\"\n"%time_str)
+        config_out.write("Run_date: \"%s\"\n" % date_str)
+        config_out.write("Run_time: \"%s\"\n" % time_str)
         config_out.write("###############################################\n")
 
     # Initialize the simulation
     if args.catalog is not None:
         catalog_module = importlib.import_module('Catalog.'+args.catalog)
-        obs = Observation(config=config, Catalog=catalog_module.Catalog, work_dir=config['work_dir'], data_dir=config['data_dir'])
+        obs = Observation(config=config, Catalog=catalog_module.Catalog,
+                          work_dir=config['work_dir'], data_dir=config['data_dir'])
     else:
         catalog_module = None
-        obs = Observation(config=config, Catalog=None, work_dir=config['work_dir'], data_dir=config['data_dir'])
-    
+        obs = Observation(config=config, Catalog=None,
+                          work_dir=config['work_dir'], data_dir=config['data_dir'])
+
     # Run simulation
     obs.runExposure_MPI_PointingList(pointing_list=pointing_list)
 
-if __name__=='__main__':
+
+if __name__ == '__main__':
     run_sim()