Abstract: Arming at airborne dual-antenna squinted InSAR imaging processing procedures，the paper has analyzed the characteristics of the distance course of two antennas echo signals, the feature of the azimuth Doppler frequency and the difference among them when the squint angle of InSAR system is zeros. The range shift factor and scaling factor used in the auto-registration imaging procedures base on the extended Chirp Scaling (ECS) algorithm have been discussed. The paper has given the basic formulations and definite implementation procedures. By means of computer simulation, the paper has taken out the highly accurate range auto-registration based on ECS imaging algorithm of the airborne dual-antenna squinted InSAR data. The statistic characteristic of correlation coefficient of two images after auto-registration is given and the quality of interferometric fringes image has been contrasted. The simulation result demonstrated that the basic formulations and definite implementation procedures in this paper are right and the validity of the algorithm presented in the paper is proved.