Based earthquakes and on the buffer and active faults in the overlay methods of GIS spatial analysis, the relationship between Southern Yellow Sea is quantificationally studied. Statistics on the overlay analysis between earthquake epicenters and 10 kin, 20 km fault buffers gives the number of earthquakes for each buffer region, and shows that NW - NEE strike faults are the major earthquake-related active faults. Analysis on the overlay analysis between earthquake buffers and active faults gives the number of active faults that influences the occurrence of earthquake.