Abstract: As the key material of the flameproof actuator, the box body has strict deformation requirements for the flameproof surface, and needs to meet the flameproof standard requirements. Most flameproof product designs and structural optimization mainly consider the deformation after explosion testing, but there is little reserach on the deformation of the flameproof surface during explosion testing. In response to this problem, this paper uses SolidWorks Simulation to analyze and study the deformation of the flameproof surface during and after the test of the flameproof actuator box, study the deformation of the flameproof surface during the explosion process, analyze and design the structure according to the actual deformation, compare the simulation analysis results and test data before and after optimization, demonstrate the feasibility and effectiveness of the ratio optimization scheme. It would provide new ideas for the structural design of the similar flameproof shell parts.