Abstract: The Pingbei area is a typical slope on the west side of Xihu Sag. The structure in work area is complicated because abundant faults are developed. It is necessary to study the characteristics of the faults because they play an important part in the analysis of sedimentary system and the research of oil and gas accumulation. On the basis of fine tectonic interpretation, this paper conducted the following steps to study the fault system in Pingbei area: analyzed the genetic mechanism of the faults and their tectonic evolution characteristics; summarized the tectonic style and the characteristics of structural traps; analyzed the effect of fault evolution on sediments and traps in Pingbei area. It lays a solid foundation for the next step to carry out research on sedimentary system, sand control mechanism, accumulation characteristics and main control factors, so as to better meet production needs.