The dividing method of the rainfall pattern in July，the circulation features and the forecasting criteria of each rainfallpattern are summarized．The relationship is analysed between the three rainfall patterns and the factors of SST in eastern equatorial Pacific，the circulation at500hPa level in Winter，the subtropical high in western Pacific in Spring，as well as the QBO windphase in Summer．This method is of some guide to the forecast of China precipitation inJuly．