This paper introduces a procedure of Interferometric SAR（InSAR）processing

including the algorithms of image registration and phase unwrapping.A coarse-to-fine fast registration framework

based on the mean square difference function

is proposed.Aiming at the interferogram with large size and dense residues

two unwrapping algorithms are presented:one is the multi-patches method to connect opposite residues

and another one the center expanding method to search opposite residues.These two algorithms can avoid long branch cuts and excessive connection of residues

and are well employed in the experiments of ENVISAT-ASAR datasets.Compared with conventional methods

our results of registration and unwrapping show good advantages in InSAR data processing.