Aiming at the complex lock structure model and heavy workload, on the basis of the Vb language and Fortran language, we realize the lock parametric modeling and automatic subdivision, and develop the chamfer triangular gate lock structure optimization system using particle swarm optimization algorithm. Taking the minimum usage of concrete as the objective function, we verify the validity and practicability of the system optimization in the engineering project. The results may serve as reference for the lock structure design.