Abstract: InSAR and differential interferometric synthetic aperture radar(D-InSAR) are generally introduced;Zhongba earthquake which occurred in July 12,2004 between Tibet Xigaze area Zhongba county and the Ngari area(northern latitude 30.5,east longitude 83.4°) with the Lishi magnitude 6.7 is selected as an example to obtain the coseismic deformation field with the two-pass differential interferometric processing method.The Okada elastic half space dislocation model is used to inverse inversion this earthquake's center of origin parameter,to obtain the focal mechanism solution.