Using the local seismic events which were recorded by seismic networks of Shanghai and it＇s adjacent areas and some artificial blasting events, adopting seismic tomography method, the 3 D P, S wave crust velocity structure of this region is inversed. The tomographic images in different depths show that the P, S wave velocity perturbation orientates NW direction. Most of local earthquakes occurred in low velocity zones, it indicates that earthquake activity is not only related to active faults and maybe linked to crustal structure and its material property. There is a close relationship among velocity structure, active faults and upper crustal materials in Shanghai and its adjacent areas.