In this study,the regional crustal movement background is analyzed using various types of regional crustal deformation data including vertical deformation,GPS,mobile gravity,and cross-fault short line observation in the Minxian-Zhangxian MS6.6 earthquake zone located at the northeastern margin of the Qinghai-Tibet block.On the basis of regional geological structures,dynamic environment,and existing research findings,the anomaly characteristics of crossfault deformation and its possible mechanism also are discussed.The results show varying degrees of medium-and long-term seismogenic backgrounds in the west Qinling and Liupanshan tectonic province such as a GPS horizontal compresso-locked zone with high strain accumulation andan anomalous GPS vertical uplift belt with a high gradient,in addition to an abrupt change in the pull of gravity prior to the Minxian-Zhangxian earthquake.Moreover,a fault deformation anomaly near the Lintan-Minxian fault caused the earthquake,and its peripheral-related structure realm showed significant temporal and spatial fluctuation up to the time of the earthquake.Particularly since the Wenchuan MS8.0earthquake,the abnormal fluctuations of cross-fault deformation have reflect that the influences from the active dextral rupture of Longmen Mountain seismogenic structure adjacent to the regional tectonic belt have promoted the formation of this tectonic province and the seismogenic process of the Minxian-Zhangxian earthquake.Further,varying degrees of medium-and long-term seismogenic backgrounds exist in the area;therefore,it is difficult to determine the impending earthquake stage because few earthquakes above 6have occurred since the data of crustal deformation in this region has been accumulated.Nonetheless,earthquake data must be continually accumulated,evaluated,and improved.