Abstract: Synthetic Aperture Radar (SAR) imaging is the basis for tracking maneuvering target,the traditional radar imaging schemes are established based data fusion and image registration,when the non similarity characteristics of moving targets have fracture edge,the SAR imaging performance is bad for the fast moving target.The iris edge contour segmentation technique is introduced,a kind of SAR radar imaging method is proposed based on iris edge function calculation and region segmentation of gray level profile curve.The model of synthetic aperture radar echo is constructed,evolution equation of edge function of iris contour segmentation is obtained,and accurate SAR radar imaging is obtained.SAR imaging simulation is taken with 4kinds of high-speed flight targets,the results show that the algorithm can avoid imaging defocusing resulted from the distance dispersion and Doppler time deviation,edge feature can be extracted comprehensively,imaging resolution is high.It has better application value in the field of radar target recognition.