Abstract: In order to solve the problem of lacking GCPs(ground control points) during the process of multi-strip InSAR(Interferometric Synthetic Aperture Radar) images localization and mosaic,a union localization method is proposed in this paper.This method makes the use of the bundle block adjustment principle in photogrammetry,and uses the height of every point after interferometric calibration.The experimental result of multi-strip InSAR images in Sichuan province shows that this method is feasible,and the precision reaches the same level of the traditional method of correcting each image respectively.Then the influence factors on block adjustment accuracy are analyzed,these factors include the number of GCPs,the position of GCPs,the degree of overlap area and the terrain.At last,the basic principle of distribution plan of GCPs is given.