Abstract:Sichuan, where wheat stripe rust occurs frequently, is considered as the inoculum sources of Puccinia striiformis West. in autumn. The time for disease emergence on the autumn-sown wheat seedling have become earlier than ten years ago and longer epidemic period and higher severity of the disease have been observed in the whole seasons of wheat growing. Great efforts have been paid to the epidemiological survey of the disease in Sichuan in the past 20 years and the data were collected from 132 counties and analyzed using GIS technology in order to reveal the epidemic characters of the disease and dispersal routes of the pathogen. The results indicated that Sichuan could be divided into four epidemic zones of wheat stripe rust on the basis of the ecological conditions, climate characters, disease occurrence and spreading as well as the systems of wheat production. i.e., over-summer area in northwestern Sichuan, over-summer and winter-reproductive area in southwestern Sichuan, winter-reproductive area in Sichuan Basin and spring epidemic area in southeastern Sichuan. Pathogen inoculum of stripe rust could be spread by four dispersal ways along Min River, Fu River, Tuo River and Jialing River in the direction from north to south and from west to east in Sichuan Province.