In this paper, we carried out water area seismic imaging detection, in order to find out whether there is water hidden fault near Qinhuangdao tourism artificial island, The results show that one fault is located in the northeast side of the Qinhuangdao tourism artificial island and Another fault is located in the south of it, with steep dip angle of fault, breakpoint buried shallow, about 3m from the seabed. Combined with regional tectonic earthquake and city of Hebei Province, seismic active fault detection and seismic risk evaluation of project results, and comparative analysis, that the two faults are the bedrock fracture, does not have the dangerous conditions and earthquake occurrence.