Abstract:The Menyuan MS6.9 earthquake occurred at 1:45:27 on January 8, 2022 in Haibei prefecture,Qinghai Province. Based on geodesic data,a detailed analysis of tectonic movement,strain evolution and deep deformation characteristics in the focal area is of great significance for earthquake mechanism and post-earthquake risk analysis. In this paper,the GNSS velocity field data of the Chinese mainland during 1991 to 2016 is used as the background to analyze the kinematic characteristics of each fault zone in the northeastern margin of the Tibetan Plateau after deducting Euler rotation. Based on GNSS velocity field and by using least square configuration method during 2017 to 2020, the crustal strain and its dynamic evolution characteristics in and around the epicenter were analyzed. With profile projector and using nonlinear fitting method,the depth of the slip velocity and fracture closure of Tuolaishan and Lenglong ridge fault were calculated,and we reached following results: ① In the northeastern margin of Qinghai-Tibet plateau,kinematics characteristics of different fault is various,i.e. the overall is predominant by shortenning crust movement,but local area with rotational deformation; ② The epicenter is located at the edge of the region with high value of surface expansion and maximum shear strain rate,which is basically consistent with the previous understanding of strong earthquake location; ③ The spatial-temporal evolution of regional strain parameters shows that compared with the background field,the overall strain characteristics near the epicenter have little change,indicating that the fault may be in the late seismogenic stage; ④ The Tuolaishan Fault zone has a high slip rate and deep locking depth. Combined with the results of the Coulomb stress analysis,we considered that is still worth to pay attention to the seismic risk of the fault in the future.