Abstract: During the 13th Five-Year Plan period, the major river basins and sea areas were treated with comprehensive improvement in Tangshan city, the total amount of polluting emission discharged into the sea decreased significantly, and the area ratio of high quality water in off-shore area showed an escalating trend, but the number of off-shore vents were still large, and the land-based pollutants entered the sea through these vents, which caused a certain impact on the quality of marine ecological environment. As a national pilot city for the investigation and remediation of sewage outfalls into the Bohai Sea, the government of Tangshan puts forward some suggestions on supervision and management measures, such as clarifying the management responsibility of sea outfall, promoting the capacity of classification and regulation of sea outfall, strengthening the construction of supervision ability, and carrying out the dynamic update of sea outfall, by summarizing the experience of investigation and regulation methods and supervision measures, so as to provide replicable, propagable and referential experience for the nationwide comprehensive investigation and regulation of Bohai Sea outfall.