Abstract: In order to design flameproof shell of coal mine equipment with the optimum wall thickness more efficiently, three-dimensional parametric model of the flameproof shell was established and variable need to be optimized was set by use of Pro/E three-dimensional design software, finite element analysis of the model and goal driven optimization analysis of the variable were performed by use of ANSYS Workbench finite element analysis software, and the optimum wall thickness was obtained which meet requirement of flameproof and the lightest shell weight, so as to save material and reduce design cost.