Taking the Xuwei New District’s compliance tail water drainage project as an example, the construction of offshore pipeline connection is greatly affected by sea winds and waves and water levels. The coastal mud flat area is deep and there are surrounding factors such as breakwaters, sea dikes, and breeding areas that require high protection. The construction is difficult. This article introduces the design and construction plan for the sea connection between the pipe jacking section and the pipe laying section of different pipe diameters.The rationality and reliability of the plan are analyzed and calculated to provide reference for similar projects.