According to the fault that fuzzy C-means clustering algorithm is easily involved in loal extreme and is sensitive to initial value,a kind of PSO fuzzy clustering algorighm is proposed,this algorithm searches the optimal clustering center based on PSO algorithm,uses WFCW to conduct weighted fuzzy cluster and is able to relatively more largely improve the validity of the cluster.This algorithm is used in diagnosis simulation in the fault diagosis of gas blower group vibation and the results show that this algorithm can relatively more largely improve the accurate rate of fault diagnosis.