Abstract: It is difficult to look for and delineate Mesozoic local structures in areas with comphcated surface terrain,seismcgeologic condition, and geologic structures. If we take the Mesozoic strata as an object to develop the high precision gravity data secondarily, the local structures can be explored, delineate, and judged, by using quasi neural network 3D inversion and statistical judgement inversion to reprocess the gravity data and doing comprehensive geological and geophysical interpretation by combining with geologic, drilling, and seismic data. This can remedy the disadvantage of using single seismic method. This paper expounds via real examples the methodology and results of processing and interpretation of old high precision gravity data in secondary development.