Abstract: In viewing of the characteristics of the complex fault block groups in Nanyang depression and the problems of seismic data, this paper focuses on study of high- precision noise attenuation technology, in - phase stack technology and migration imaging technology for use in complex fault block. A set of processing schemes and processing parameters suitable for the complex fault block groups in this area are presented. Actual application in processing of the seismic data in Nanyang depression has improved exploration effects.