diff --git a/ObservationSim/Instrument/Filter.py b/ObservationSim/Instrument/Filter.py
index d02416950904d970585f4873e0183823c99377fa..62d1b9416b9c7d54cf74aa05a28318b3419d3ec5 100755
--- a/ObservationSim/Instrument/Filter.py
+++ b/ObservationSim/Instrument/Filter.py
@@ -40,6 +40,7 @@ class Filter(object):
         self.sky_background = filter_param.param[filter_type][5]
         self.mag_saturation = filter_param.param[filter_type][6]
         self.mag_limiting = filter_param.param[filter_type][7]
+        self.zodical_spec = None
 
     def is_too_bright(self, mag, margin=-2.5):
         return mag <= self.mag_saturation + margin
diff --git a/ObservationSim/ObservationSim.py b/ObservationSim/ObservationSim.py
index da3e9f16ae8f973540f01553d46377e621cfefab..0822789e40b974826e0b836b79e187c6f5b80787 100755
--- a/ObservationSim/ObservationSim.py
+++ b/ObservationSim/ObservationSim.py
@@ -108,9 +108,10 @@ class Observation(object):
         chip.img.setOrigin(chip.bound.xmin, chip.bound.ymin)
         chip.img.wcs = wcs_fp
 
-        filt.setFilterStrayLightPixel(jtime = pointing.jdt, sat_pos = np.array([pointing.sat_x, pointing.sat_y, pointing.sat_z]), pointing_radec = np.array([pointing.ra,pointing.dec]), sun_pos = np.array([pointing.sun_x,pointing.sun_y,pointing.sun_z]))
+        if self.config["obs_setting"]["enable_straylight_model"]:
+            filt.setFilterStrayLightPixel(jtime = pointing.jdt, sat_pos = np.array([pointing.sat_x, pointing.sat_y, pointing.sat_z]), pointing_radec = np.array([pointing.ra,pointing.dec]), sun_pos = np.array([pointing.sun_x,pointing.sun_y,pointing.sun_z]))
 
-        print("========================sky pix========================\n")
+        print("========================sky pix========================")
         print(filt.sky_background)
 
         if chip.survey_type == "photometric":
diff --git a/config/config_C6.yaml b/config/config_C6.yaml
index ff0e202ea0b84d3fcad52d9246197365da973569..087de4f806734afba835509cb784ee3fe5dc05ef 100644
--- a/config/config_C6.yaml
+++ b/config/config_C6.yaml
@@ -105,6 +105,9 @@ obs_setting:
   # Whether to enable astrometric modeling
   enable_astrometric_model: True
 
+  # Whether to enable straylight model
+  enable_straylight_model: False
+
   # Cut by saturation magnitude in which band?
   cut_in_band: "z"