Structure design and calculation of Chinese fishing vessel generally adopt manual or Excel method based on standards, and a structure calculation book shall be prepared for each vessel according to the principal dimensions and corresponding specifications of different vessel types. In order to improve the calculation efficiency of designers, according to Rules for the Construction of Sea-going Steel Fishing Vessels (2015) of original Register of Fishing Vessel of the People's Republic of China, C#.NET+SQL Server is used for development of structure calculation software for fishing vessel, where the function of software update is reserved to make structure design of fishing vessel always comply with the latest applicable specifications. The software realizes functions of printing and exporting structure calculation book of PDF format. It can be used not only for design of structure drawings such as general structure plan, but also directly for examination of plan approval agency, which greatly improve the structure design efficiency of fishing vessel.