In the teaching of mechanical design course design,Solidworks,a computer aided design software,is introduced as an auxiliary teaching method.Through the unique simulation function of the software,the virtual models of closed gear transmis-sion,bevel gear transmission,open gear transmission and sprocket winch mechanism are established.The transmission mecha-nisms are assembled,the design scheme is checked and optimized,and the motion simulation of the transmission device is real-ized,and the simulation design of the mooring device of the windlass is completed.It has trained the students'software skills,en-hanced the students'in-depth understanding and application of theoretical knowledge,stimulated the students′interest in the in-depth study of mechanical course,improved the students'level of mechanical design,helped to cultivate the students'engi-neering practice and comprehensive application ability,and achieved the expected teaching effect.