By using of the 1951-2013 summer monthly precipitation data in China and the NCEP/NCAR monthly mean meteorological reanalysis data(horizontal resolution 2.5°×2.5°),select 17 station as Middle and Lower reaches of the Yangtze River. Analyze the relationship between South Asian High(SAH) and SummerSrainfallSanomaly in Middle and Lower reaches of the Yangtze River by adopting the method of synthetic analysis and correlation analysis. Results indicate that in the rainfallSanomaly bullish years, central geopotential of SAH obviouslySon theShighSside, position by west. In May the east-west span is larger, area is larger. in the rainfallSanomaly lower years, central geopotential of SAH is smaller. In May, Center is located in Indochina Peninsula,area is smaller. It is found that in the rainfallSanomaly bullish years, characteristicSparameters of SAH is Quite different with annualSaverage. The precipitation of summer rainfallSanomaly years and Ridge index in May exist significant relation.