The　characteristic　of　the　diaphragm　spring　has　great　influence　on　the　performance　of　the　clutch,　so　the　diaphragm　spring　optimization　design　is　very　important　in　the　clutch　design　work.　In　this　paper,　Particle　Swarm　Optimization　(PSO)　algorithm　with　global　convergence　is　used　for　multi-objective　optimization　design　of　pull-type　clutch　diaphragm　spring.　Through　optimization　design,　the　better　performance　of　diaphragm　spring　is　obtained.