通过对覆盖同一地区的升降轨道ASAR雷达数据进行两路差分干涉（D-INSAR）处理，得到了2003年12月26日伊朗巴姆（Bam）地震（Mw6．5）在两种成像几何状态下的视线向（LOS）同震形变场。利用Okada弹性形变模型对形变场进行正演计算，得到地震断层的几何参数及形变的南北向分量。对得到的干涉条纹图进行相位解绕处理，综合分析两种不同的雷达成像几何关系，并利用模型估计得到的南北向分量，计算了该地震造成的3D同震形变场，结果显示了典型的单断层右旋走滑活动特征。研究表明，合并升降轨道雷达数据，能够为形变模型提供有效约束，用一条简化的断层模型就可以解释升降两条轨能的干涉形变场，更为复杂的双断层模型是不必要的。

We processed the ascending and descending pass ASAR radar data that covers the same area using 2-pass D-INSAR technology,and got the co-seismic deformation field in LOS direction of the Bam(Iran) earthquake(Mw6.5), which happened on Dec 26,2003,with two kinds of imaging geometry.After forward modeling of the co-seismic INSAR results using(Okada's) elastic model in half-space,we got the geometric parameters of the seismic fault and the north-south component of the deformation field.We unwrapped the interferometric phase and computed its 3D co-seismic deformation field by combining the two kinds of imaging geometry and the north-south component from(Okada's) model.The 3D deformation field shows typical characteristics of single right-lateral strike-slip fault.The research also shows that integration of ascending and descending pass radar data could provide effective constraints for deformation models.The Bam Co-seismic deformation field could be interpreted by the simplified 1-fault model,therefore the complex 2-fault model is unnecessary.