diff --git a/csst_ifs_sim/csst_ifs_sim.py b/csst_ifs_sim/csst_ifs_sim.py
index b97d21889a04c8f82812512e124154f7d18a44a0..15c1c2b82adc46fb023dce487ebbe0b7c24ea066 100644
--- a/csst_ifs_sim/csst_ifs_sim.py
+++ b/csst_ifs_sim/csst_ifs_sim.py
@@ -4762,10 +4762,14 @@ if __name__ == "__main__":
         
     if len(sys.argv[:])>=2:
         configfile=sys.argv[1]+'IFS_inputdata/configData/IFS_sim_C90.config'
-        if not os.path.exists(fonfigfile):
+        if not os.path.exists(configfile):
             print('The given input fonfigfile path is wrong......')
             sys.exit(1)
             
+            
+    configfile=configfile0  
+
+    
     if len(sys.argv[:])>=3:
         sourcein=sys.argv[2]
         
diff --git a/tests/test_ifs_sim.py b/tests/test_ifs_sim.py
index c86b8fad11a86d328b226b3c4f81e763ceba1195..c8483a8d299ec9cb29187651a9af59ba4158981d 100644
--- a/tests/test_ifs_sim.py
+++ b/tests/test_ifs_sim.py
@@ -34,6 +34,9 @@ class TestDemoFunction(unittest.TestCase):
         # demo function test
         dir_path=os.path.join(os.environ['UNIT_TEST_DATA_ROOT'],'ifs_sim')
         
+        print(dir_path)
+        
+        
         csst_ifs_sim(dir_path)
         
         self.assertTrue(