Abstract The coseismic deformation field of the 2022-01-08 Menyuan earthquake is obtained by DInSAR technology based on Sentinel-1A data. The focal parameters and fault plane slip distribution are determined by using elastic half-space dislocation model and distributed slip model. The deformation field of InSAR ascending and descending orbit is traversed by the Lenglongling fault, and the maximum deformation of line-of-sight direction are 50 cm and 70 cm, respectively. The focal mechanism solution obtained from inversion shows that the strike of fault is 103° and the dip angle is 80°. The coseismic slip distribution is mainly concentrated in the range of 0-15 km, with the average slip of 0.67 m and the maximum slip of 2.45 m, showing a left-lateral strike-slip earthquake. The epicenter is located at 37.72°N, 101.34°E, and the seismic moment released is 1.718×1019 Nm, equivalent to the moment magnitude of 6.9. Based on the results and the regional structure, it is concluded that the seismogenic fault of this earthquake is the Lenglongling fault. It is necessary to pay attention to the seismic hazard in this area based on the analysis of coseismic stress variation of this earthquake.