By using the data of Southwest vortex in Sichuan Basin during June to August from 1960 to 1999, the synchro-correlative analysis is done between the frequence of southwest vortex and the rainfall of these stations.Two groups of the data which have passed the significance level test of α=0.05 are analyzed with Mexican Hat wavelet. The results show that more than half of southwest vortex during June to August in the 40 years occurred and died out in Sichuan Basin, southwest vortex that can move onward chiefly takes the eastern route. The relationship between northeast route ones and the rainfall of Taiyuan, Shijiazhuang, between east vortex and the rainfall of Hankou, and between the sum of the moving of southwest vortex and the rainfall of Neijiang are much better. By the results of wavelet analysis, it is showed that there lies much better corresponding relationship in the frequency distribution between the times of northeast or east-moving vortex and the rainfall of these stations over 10 years of temporal scale.