The characteristics of anomalous precipitation in the autumn of 2011 and its possible mechanism were investigated. The results showed that autumn rain of 2011 in West China was very typical, with the following features, namely the easterly and northerly being more precipitation areas, more overcast or rainy days, prominently concentrated precipitation phases, and strong extremeness. The anomaly of autumn rain in West China was featured mainly by a response to the typical La Nina event which started in September 2011. Furthermore, the decadal variation may be one of the important causes for the anomalous autumn rain in West China.