Abstract: To solve the structural lightweight and maximum stress minimization problems being a worldwide concern in the optimization design of the coupling，this paper makes structural topology optimization plate design on the SSWZ330 type cross-shaft universal coupling by making use of the finite element analysis software of Hyperworks and adopting the evolutionary structural optimization method． After the optimization of structural topology optimization plate design，the weight of materials can be saved by 9． 17%，the maximum static strain can be reduced by 2． 3%，and the maximum stress can be reduced by 52． 1%，improving the structural performance，reducing structural weight，and expanding the practical engineering application of Hyperworks software in the field of topology optimization design of mechanical parts．

Key words: coupling, finite element analysis, evolutionary structural optimization, topology optimization