Based on the practical engineering projects,this paper sets up 3D finite element models with ANSYS.Using the numerical simulation analysis,this paper gets the deflections and stress distribution laws under different working conditions of double-hinged ship locks,trying to find the key factors influencing the design of ship lock by analyzing the impact of the floor thickness on the working characteristics of double-hinged lock chamber structure.It is of great importance for guaranteeing the safety and stability,and helpful for choosing the optional structures.