In this paper,the point surface displacement data of 43 GNSS continuous tracking stations in Yunnan region in 2014 were deeply processed in order to obtain the regional surface strain parameters. By taking the starting date of January 1,2014 and ending the sliding time with a window length of 4 days,the regional surface strain change characteristics at different time nodes were obtained. Based on the Yingjiang M_S6.1,Ludian M_S6.5,and Jinggu M_S6.6 earthquakes as samples,the relationship between the spatiotemporal evolution of GNSS surface strain and M ≥ 6.0 earthquakes was analyzed. The results show that the Yingjiang M_S6.1,Ludian M_S6.5,and Jinggu M_S6.6 earthquakes are strongly related with the dynamic changes of the GNSS plane strain shrinkage area. Before these three strong earthquakes,a large area of contraction and enhancement appeared around the epicentral area,and there was a large area of enhanced compressive activity. The pre-earthquake strain field was greatly adjusted,and significant regional changes may be important features before M ≥ 6.0. From the perspective of epicenter distribution,all three earthquakes occurred in the area of enhanced surface contraction,and the enhancement of surface strain compression may be more conducive to the induction of strong earthquakes.