In this study,based on ERA-Interim reanalysis data taken four times a day and daily precipitation data from 753 stations throughout China,the characteristics of summer precipitation in the Yangtze-Huaihe River Basin from 1980 to 2013 are analyzed.The forecast signal of summer low-frequency precipitation in the Yangtze-Huaihe River Basin is explored.The results show the following:1) The 10—30 days low frequency precipitation,which occupies a large proportion in the summer precipitation,can influence the summer precipitation over the Yangtze-Huaihe River Basin.2) At 200 hPa,there is a low-frequency anticyclone moving from the northeast of the Tibetan Plateau to eastern China 9—6 days before the low-frequency precipitation process occurs.At 500 hPa,the Western Pacific Subtropical High moves from east to west,reaching the eastern coastal areas of China 9 days before the occurrence of the low-frequency precipitation events.The center of negative low frequency OLR in the tropics moves northward and reaches the strongest point when its northern most tip reaches the Yangtze-Huaihe River Basin.The above circulation distribution will promote the occurrence of the low-frequency precipitation in the Yangtze-Huaihe River Basin,or vice versa.3) The Tibetan Plateau prediction signal can effectively supplement the deficiency of the West Pacific Subtropical High and the Tropical OLR Signal.The accuracy of precipitation process prediction relying only on the low latitude signals can be improved by using the Tibetan Plateau Signal,the Western Pacific Subtropical High Signal and the Tropical OLR Signal as the comprehensive predictors.