Structural optimization based on the Finite Element Method (FEM) is used for the optimization design of Dongfeng-11 locomotive salvation vehicle under prop structure. In FEM analyzing

considering stress conditions

stress distribution analysis is made to each parts of the salvation vehicle to find out possible places which may cause stress concentration. With FEM analyzing

we find that on some surfaces of main parts of the vehicle

big stress concentration occurrs. we carry out on the detailed analysis the main causes of stress concentration

and propose a new structure that can improve stress concentration.