This paper mainly discusses the high-precision co-registration methods for interferometric synthetic aperture radar（InSAR） complex image.After several registration methods are reviewed and compared

a new method of the co-registration for two single looking complex（SLC） SAR images（the master image and the slave image） based on coherence coefficient

harris feature points

wavelet pyramid and Triangulated Irregular Network（TIN） based differential rectification was proposed.The experiment with space-borne InSAR（ERS 1/2） showed the method accomplished co-registration in about 43 seconds with a coherence 0.719855.It proves that the accuracy of this method can satisfy the requirement of Interferometry.