The total precipitation data of 129 representative stations during June to August from 1959 to 1989 in 5 northwestern provinces of China, was resolved by EOF method.The summer precipitation fields was divided into 5 patterns of space distribution.The teleconnection and typical field of the time coefficient and simultaneous Eurasian 500hpa latitudinal deviation field have been compared. The features of circulation field corresponding to the summer precipitation patterns are given in northwestern of China.