Abstract:Our research is based on the airborne gravity data from GT-2A gravimeter and the high-precision ground gravity data collected in two areas, marked as A, which is flat, and B, which is steep. We calculate the internal precision of GT-2A gravimeter by network crossover adjustment, and evaluate its external precision by comparing the continuation results of airborne and ground gravity data. The results show that the inner precision of GT-2A gravimeter is less than 1 mGal, while its external precision is less than 2 mGal in zone A, and 3 mGal in zone B.