After nearly 30 years investigation, 82 gas hydrate mineral fields have been discovered in different oceans in the world. It is estimated by the geo - scientists that the bearing amount of carbon in methane in gas hydrate is twice of that in all cruel oil, natural gas and coal in the world. The reserve resources of petrolem and natural gas, may exist at most several decades in the future. Thus the scientists have regard gas hydrate as a new future energy. According to the result of the investigation by high - resolution seismic methods, the continental slope area in northern South China Sea demonstrates obvious geophysical mark of bearing gas hydrate.