Abstract: In terms of wavelet, vortex and moisture flux divergence analyses, study is undertaken of 2004 rainstorms from June to August in Anhui. Results show that the elements exhibit significant 2~6 d, 7~15 d and 18~30 d oscillations. The variations of 2~6 d and 7~15 d oscillations of the these elements are almost consistent with the anomaly of precipitation from mid-June to later-June. The vortex of the 7~15 d oscillation moves towards Anhui along the mid-latitude from west to east, and the moisture flux divergence of the 7~15 d oscillation moves towards Anhui from low-latitudes. The cyclone and anticyclone wave trains of the 7~15 d oscillation moves towards northwest over the equatorial west Pacific Ocean and the high frequency change of the streamline field at low levels provide favorable conditions for Anhui rainstorms in June 2004。