diff --git a/csst_mci_sim/csst_mci_sim.py b/csst_mci_sim/csst_mci_sim.py
index cb467b8962656a663f32f2a6ed13ff8068fc40d0..da18bf043970f3135a50a40a65fe49c9ad9bf5ab 100644
--- a/csst_mci_sim/csst_mci_sim.py
+++ b/csst_mci_sim/csst_mci_sim.py
@@ -1711,13 +1711,11 @@ class MCIsimulator():
                 parallax_list = self.star['parallax_gaia'].tolist()
                 rv_list = [0.0 for i in range(len(ra_list))]
 
-            # ###############################################
+            ################################################
             newRa, newDec = shao.onOrbitObsPosition(self.information['dir_path'], ra_list, dec_list, pmra_list,
-                                               pmdec_list, rv_list, parallax_list, len(ra_list),
-                                               self.information['pos_x'], self.information['pos_y'], 
-                                               self.information['pos_z'], self.information['velocity_x'], 
-                                               self.information['velocity_y'], self.information['velocity_z'],
-                                               "J2000", self.TianCe_day, self.TianCe_exp_start)
+                                                    pmdec_list, rv_list, parallax_list, len(
+                                                        ra_list),
+                                                    self.information['pos_x'], self.information['pos_y'], self.information['pos_z'], self.information['velocity_x'], self.information['velocity_y'], self.information['velocity_z'], "J2000", self.TianCe_day, self.TianCe_exp_start)
         else:
 
             if get_file_extension(starcat) == '.fits':