Abstract: On the basis of previous submarine pipeline survey results many times in the East China Sea, this article analyses and discusses the varied factors of cause current scour action, which can be divided into two major factors of the internal marine environment and the external environment change, and probably harm to the pipeline, and sums up the space condition of the pipeline, the sea floor form and the sea-bed erosion and deposition changes under the long-term current erosive, put forward some suggestions to inspection and maintenance of submarine pipeline.