diff --git a/csst/msc/data_manager.py b/csst/msc/data_manager.py
index 7cdf27fc89bc2be5ef04716076d10945cddf4366..025c38ed5412dddfa5232eedc8bd52a132716d9b 100644
--- a/csst/msc/data_manager.py
+++ b/csst/msc/data_manager.py
@@ -165,7 +165,6 @@ class CsstMscDataManager:
                 self._exp_start, self._exp_stop, self._exp_id, ccd_id, suffix, ext)
         return os.path.join(self.dir_l1, fn)
 
-    @property
     def pc_combined_image(self, suffix="img", ext="fits"):
         """ combined image
         suffix:
@@ -176,7 +175,6 @@ class CsstMscDataManager:
         fn = "combined_" + "{}.{}".format(suffix,ext)
         return os.path.join(self.dir_l1, fn)
 
-
     @property
     def pc_ref_cat(self):
         """ reference catalog """