With the establishment of the Crustal Movement Observation Network of China (CMONOC) and the China Tectonic Environment Monitoring Network (CMTEMN),earthquake coseismic displacement can be obtained through global navigation satellite system (GNSS) data processing and analysis.The calculated results can provide basic research data for further study on seismic dynamics characteristics and determination of future earthquake trends.Using the GNSS data processing results from CMTEMN and CMONOC,together with the coordinate time series from the continuous observation stations,the baseline time series between two stations and the velocity and deformation fields were investigated in this study.In addition,the global positioning system deformation field of the northeastern margin of the Qinghai-Tibet plateau before and after the Minxian-Zhangxian Earthquake was analyzed.The results showed that the coordinate time series of the GNSS stations showed no noticeable change before the Minxian-Zhangxian Earthquake,and there were no prominent anomalies before the earthquake.The earthquake caused different levels of permanent co-seismic displacement of various stations,the maximum of which was as much as 16 mm This GSMX station,which is near the epicenter in the Lintan-Dangchang fault,exhibited a noticeable coseismic displacement.The GSWD station had no coseismic displacement.Similarly, the GSLX station,which was far from the epicenter,also experienced no displacement.The strain change of the three stations proved that the east-west strain was primarily linear,and there was no noticeable imminent anomaly before the earthquake removal of the coseismic step.The north-south strain exhibited a cycle and a half phenomenon,which was related to a corresponding year cycle in a single point,so this was not an obvious imminent anomaly prior to the earthquake.In addition to the obvious linear change,the north-east shear strain showed specific cycles,but no obvious anomalies before the quake,and these were restored to their original displacement after the quake.The GNSS baseline length change was based on the unity of the reference frame,so it was unaffected by the reference benchmark,therefore,it would objectively reflect the dynamic changes of the relative motion between two stations.Therefore,the GNSS baseline time series analysis was used to extract the crust movement microdynamic information as one of the direct routes.In this study,three stations close to the epicenter formed a triangular mesh,crossing the epicenter and the Lintan-Dangchang fault zone.Using the GSWD station as a reference, the statistical baseline series of the GSMX and GSLX stations were analyzed,and the results showed that there was no significant change of the baseline before and after the earthquake and no obvious anomalies;In addition,the long baseline time series across the Lintan-Dangchang fault was calculated employing six stations on either side of the seismogenic tectonic,forming five baselines.The results were same with the short baseline,before the earthquake,the baseline did not exhibit an obvious precursory change phenomenon,and the baseline change caused by the earthquake was not obvious in totality.There were signs of a clockwise motion near the Alashan and Qilian structural belt,where the direction of movement was south west on the east side and north west on the west side.The magnitude of the movement was within 7,which may explain why the push movement to the north in the western region was greater in the eastern area.In addition,due to the extrusion of the Ordos block in the east of the research area,the direction of movement of the edge of the block at the southeastern end in this region was to the southwest and its velocity was approximately 5 mm/a,The movement of the block was diminished in the western portion.The primary direction of the principal compressive strain from 2011 to 2013 was from the SE to NW,the region of maximum strain exhibited zonal distribution and was located in the southern part of the research area.