Based on the compilation of the joined marine-continental maps for Shang-hai and its neighboring areas, the seismic-geologic analysis and interpretationare made for maps of gravity and magnetic anomalies so as to extract infor-mation related to seismism. The eastern deep boundary between the two largecontinental blocks of China is indicated; the boundary in Shanghai area bet-ween two great tectonic units, i. e., Yangtze paraplatform and South China foldsystem, is suggested; on the basis of a discussion on characteristics of faultsand general regularity of this area, this paper demonstrates the existence ofsome active fractures, thus providing basic data and scientific grounds for theseismic structural regionalization and the formulation of anti-seismic measures.