Abstract：Aiming at the problem of complex transfer relationship of force and deformation in the 3-PRS parallel mechanism, the finite element method is used to study the deformation distribution. The mechanism parameters of the moving platform are obtained based on the principle of inverse kinematics in different postures. The solid model of the 3-PRS parallel mechanism in different postures is established by using 3D modeling software. The finite element analysis software is utilized to analyze the statics and modals of the model. The equivalent deformation and stress distribution of the parallel mechanism are obtained through the statics analysis, while the natural frequency and vibration type of the parallel mechanism are obtained through the modal analysis. In addition, the influences of the natural frequency and vibration type of the parallel mechanism on the working state of the mechanism are discussed. The results can establish foundations for the relevant experiments, dynamic analysis and calculation as well as the structure optimization design for the 3-PRS parallel mechanism.

Keyword：3-PRS parallel mechanism;finite element analysis;inverse kinematics;static analysis;modal analysis;