Abstract: Multi-beam Bathymetric System, which integrating new and high technology, is the most ad-vanced bathymetric technique in the world right now. It features high precision and efficiency, and the sea floor can be surveyed with full coverage. During the process of China Exclusive Economic Zone and Conti-nental Shelf Survey Program, the water depth and sea floor topography have been probed by means of shal-low water Multi-beam Bathymetric System repeatedly at old Hupi Reef area in the northeast part of East China Sea. Later the shallow seismic and side-sonar survey have been conducted for verification. All results indicated that the so called Hupi Reef and Ya Reef was not existed. The Suyan Reef does exist, but located to the west a bit compared to the location on the old map. In the meantime, we got the precise location of the wreck ship at the south of Suyan Reef. And a new submerged reef, named "Dingyan", was discovered at northeast part of Suyan Reef.