diff --git a/ifs_data/IFS_sim_C90.config b/ifs_data/IFS_sim_C90.config
index 20ca30ff735271f10189932cd74c02c942a60708..58eab3249fb27363dd0365192a6e902ab7fbd411 100644
--- a/ifs_data/IFS_sim_C90.config
+++ b/ifs_data/IFS_sim_C90.config
@@ -6,7 +6,7 @@ CCDy = 0
 CCDxgap = 1.643
 CCDygap = 8.116
 
-sky_fitsin  =IFS_data/FengshuaiData/NGC6397_S6102.fits
+sky_fitsin  =IFS_inputdata/FengshuaiData/NGC6397_S6102.fits
 
 result_path =ifs_sim_result