Thank you, sir.
I have tried the method you provide but it does not work.
You can see the water boundary can not overlap correcetly.
I can find the 'longitude.img' and 'latitude.img' in the output file when I finished my Reprojection work.
Do these two images(longitude and latitude) can create a LookUpTable to perform georeference work in SNAP or is there any tool in SNAP can do this job?