Menyuan County is located in the northeast of Qinghai province,where has complex terrain and great height difference,and which is adjacent to the Donglongling fault zone in the north and connected to the Tuolaishan fault zone in the west. The Ms6.9 earthquake occurred on January 8, 2022 in this region.SAR images provided by Sentinel-1A are used to obtain the coseismic surface deformation field of this earthquake.The results show that there are at least three rift zones in the Menyuan earthquake, among which the main earthquake causes the most obvious rift zone, and the other two obvious rift zones with a length of about 3 km. It is inferred that two aftershocks occurred within 1 hour after the main earthquake. The main fracture zone broke along the NWW-SEE direction.The geographical location is consistent with the inference that the western segment of the Donglongling fault occurred simultaneously with the eastern segment of the Tolai Mountain fault.The results of surface deformation data show that the southwest is uplifted obviously with the maximum value of 0.66 m, while the northeast is subsidence seriously with the maximum value of 0.54 m. The deformation characteristics are consistent with the characteristics of left-lateral strike-slip type. The shockwave radius of epicenter is between 15 and 50 km and the deformation profile reflects that the distribution range of surface deformation is much larger than that of vertical fault.