Abstract: The paper established model of shell by use of SolidWorks software based on preliminary design of shell of mine-used flameproof battery case with methods of experience and analogy. It analyzed distribution regularities of stress, displacement and deformation of rectangle shell under the condition of 1 MPa pressure with finite element analysis software of SolidWorks to obtain stress value and displacement value of the shell. It found weak parts of stress of the shell, and made structure improvement for intensity surplus part and intensity weakness part of the shell to reduce weight and material consumption of the shell.