diff --git a/csst_mci_sim/csst_mci_sim.py b/csst_mci_sim/csst_mci_sim.py
index e1fcf4f083c8eff3feb8dd8571c1412aa3d31268..2e41871ed93a31d8a9174e53fc74deede3dbff30 100644
--- a/csst_mci_sim/csst_mci_sim.py
+++ b/csst_mci_sim/csst_mci_sim.py
@@ -1713,8 +1713,7 @@ class MCIsimulator():
 
             # ###############################################
             newRa, newDec = shao.onOrbitObsPosition(self.information['dir_path'], ra_list, dec_list, pmra_list,
-                                               pmdec_list, rv_list, parallax_list, len(
-                ra_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)
         else: