The first 5 coefficients of empirical orthogonal function of thepentad mean circulation at 500 mb level over Asia were obtained inpaper. The correlations between each of these coefficients and thepentad precipitation data from 49 stations of the network are calculatedrespectively. The method of cross-spectral analysis is used to discussthe characters of the correlations of the mean circulation to theprecipitations, and the coherence functions are computed as well. Apreliminary research has been made on the time-space structure andsome quasi-periodic oscillations have been found. The findings willcontribute new information on the problem of long-range precipitation forecasting in China.