The high-precision measurement of control points in karst topography areas holds significant value for regional topographic mapping and hydrological testing.Traditional surveying in karst regions is challenging due to sparse CORS stations and severe multipath effects in static surveys,rendering single-point GNSS static measurements inadequate for achieving the required accuracy.For the established 237 GNSS E-level control points,a specific GNSS static survey scheme is devised to enhance the precision of static measurements.The main approach involves adding one all-weather fixed base station in the center of the survey area,followed by the inclusion of one mobile base station during the survey to assist other N roaming stations.The computation process incorporates data from six continuously operating CORS stations.The final static survey results meet the required standards,with the average mean error in X coordinate of the control check points being 0.007 m,and in Y coordinate being 0.018 m.The geodetic heights measured are refined using the Guangxi quasi-geoid model,and when compared to the leveled heights,the differential mean error is 0.024 m,with all points falling below the allowable error limit.The “1+1+N” static survey mode significantly enhanced the measurement accuracy in karst topography areas,and the results refined with the quasi-geoid model meet the requirements for fourth-class level survey heights.