Abstract: The crusher has become an integral part of the coal washing technique. The crusher has complex working conditions in the crushing process. So its safety and reliability are the focus of the study. This paper presents a new type of crusher tooth that’s double key location and easy to dismantle, and analyses the force of the crusher at all points during crushing of the material. And the actual design parameters are given to calculate the specific numbers of each load. Combining with four different conditions in the process of crushing material, using the finite element analysis software analyses the stress and deformation of crusher in the using process.