diff --git a/csst_mci_sim/csst_mci_sim.py b/csst_mci_sim/csst_mci_sim.py
index d921731f466116e031c1cc90d6780a201a99735d..de3a915f03a44b27a375dabefffc3a5565c31680 100644
--- a/csst_mci_sim/csst_mci_sim.py
+++ b/csst_mci_sim/csst_mci_sim.py
@@ -1907,7 +1907,7 @@ class MCIsimulator():
         
         
         
-        # sample as ifs wavelength
+        # sample as mci wavelength
         wave_mci = np.linspace(2500, 11000, 8501) #np.arange(2500, 11000, 1)
         f1 = interp1d(wave0, zodi0)
         zodi_mci = f1(wave_mci)
@@ -1998,8 +1998,8 @@ class MCIsimulator():
             
         for j in tqdm(range(Nstar)): ###   nsrcs length  
         
-        
-            self.log.info('begin iteration........')
+            if j==0:
+                self.log.info('begin iteration........')
             
             if j<nsrcs-8:
                 starRa  = 3600.0*( newRa[j]   )  # ra of star,  arcsecond