The heavy rain process from July 28 to August 2, 2001 in Xinjiang is analyzed. It is shown that the heavy rain event is produced by the interaction and the adaptive configuration of the mult-scale systems of the higher, middle and lower layers under the anomaly change of the large-scale. Furthermore, the transportation path and its model of water vapor are given, and it is shown that water vapor of Arabian Sea and Bay of Bengal would influence South and East Xinjiang. Also the relationship between the energy front and heavy rain is discussed.