In view of the problem that Larsen type latch is easy to be torn during the driving construction of the steel pipe-sheet pile combined structure,based on the combined structure of the steel pipe-sheet pile of Lekki Deepwater Port Terminal project in Nigeria,the finite element method is used to numerically simulate and analyze the three bite conditions of Larsen type latch tension,torsion angle and inclination conditions.The research results show that the lower the occlusion accuracy of Larsen type latch,the greater the occlusion stress of the latch,and the more adverse influence on the Larsen type latch.Reference limits for the accuracy of the steel pipe-sheet pile combined structure are proposed under different occlusion states,such as tension,torsion angle and verticality conditions.Finally,it is suggested to strengthen the research on the pipe-sheet pile sinking process,improve the accuracy control and monitoring of pile sinking,reduce the unfavorable occlusion stress of the lock occlusion,and minimize the risk of lock tearing.The reference limits of the accuracy can provide a basis for the construction technical standard of the steel pipe-sheet pile combined structure,and an important reference for improving the construction quality of the steel pipe-sheet pile combined structure.