Abstract: Yuqi Area,located in the north of Akekule uplift,is an important oil and gas exploration area around Tahe oilfield.By using the methods of fine interpretation and coherent attribute of 3 D seismic data,the fault system in Yuqi area is described in detail.The characteristics of fault system in the study area are discussed from the aspects of fault properties,fault patterns and structural evolution.The results show that:Yuqi area is affected by Akkumu fault and Luntai fault,Luntai fault controls the distribution of carbonate strata in Yuqi area,and the early strike slip fault is cut and reformed,which has an important influence on the vertical migration of oil and gas.The NNE-NWW trending strike slip faults are a group of independent strike slip faults formed in the early Hercynian,which are distributed in the east of Yuqi area.The NWW trending secondary strike slip faults are small in scale and have limited controlling effect on reservoirs and hydrocarbon reservoirs.The NE trending strike slip faults connect with the source rock and extend in the late stage,which is of great significance for reservoir formation and hydrocarbon migration.