The rapid development of information technology and sensor technology has given rise to the geometrically progressive in the case of remote sensing data.When images are scanned or images are zoomed,traditional method is very slow,especially when all images are zoomed,all images are read,images are got at intervals,whose slow speed is oppressive,and when the images are vectored,work efficiency is very low.This paper puts forward a project that it takes much time to rebuild image document,to make it pyramid structure,and to read the images through storage mapping file technique,so it is very simple.Thus,it is not necessary to wait when the images are scanned or zoomed.