The ship lock project is always large in volume and complex in structure. Traditional two-dimensional reinforcement technology has the shortcomings，such as low reinforcement efficiency，poor reinforcement quality and poor adaptability to engineering changes，we study the three-dimensional reinforcement technology based on BIM，and realize the automatic reinforcement of structure，reinforcement number measurement and drawing generation in three-dimensional space combining with the Jinjiaqiao ship lock project of Xiaoqinghe River re-navigation project. The results show that the three-dimensional reinforcement technology based on BIM has the advantages of high degree of visualization，information management and data-driven of reinforcement when the technology is applied in ship lock project.