The relationship between the Indian Ocean Dipole (IOD) and autumn rainfall in West China was examined statistically. The results show as the seasonal lock of IOD,there is a significantly correlation between the Indian Ocean Dipole and the autumn rainfall in West China: positive correlation develops in spring and summer, and stable in autumn, it is consistent with the delays associated in summer, but the correlation weakens and inverse in early winter. During the occurrence of positive IOD episode, the southwest (cyclonic) anomalies in the middle (lower) troposphere over West China,and the equatorial easterly wind anomaly. These circulation anomalies are related to the above normal precipitation in West China. Moreover, during the occurrence of positive IOD episode, most areas of Huaxi are moisture divergence in winter and spring, but northeastern Sichuan, Guizhou and Chongqing are moisture convergence in summer and autumn, and the water vapor transport relying on the southwest air in Bay of Bengal and easterlies outside the Western Pacific subtropical. In positive IOD episode,OLR increased. The positive phase of the summer IOD provides a potential valuable signal for predicting the autumn precipitation in West China, and the positive phase of the autumn IOD play the role of continuation of development in autumn rainfall.