Abstract: This paper mainly deal with the sharing of marine environmental information. It firstly reviews its characteristics including multi-sources,dynamic and high-dimensions,then probes into the framework construction of the multi-source marine environmental information grid platform and its crucial techniques. Then,it takes the region of South China Sea as its study area and chooses three kinds of marine environmental information that is representative for trial,to build a prototype system of multi-source marine environmental information grid platform. Finally the feasibilities and practicality of the above technical solution are well proved.