Abstract:Based on the precipitation data from 2474 weather stations and NCEP/NCAR reanalysis datasets, the possible correlation characteristics between the major summer precipitation pattern in East China and the spring apparent heat sources over Tibetan are investigated with Empirical Orthogohal Function (EOF), correlation and Morlet wavelet analysis method, in addition, the influencing mechanism of the apparent heat source(Q1) on the distribution of summer precipitation anomaly is preliminarily analyzed. The results of EOF analysis show that two major precipitation patterns exist in eastern China: South China-Jianghuai and Middle-lower Yangtze River pattern; results of correlation and period analysis show that Q1 of the southern Tibetan at 300 hPa,400 hPa and northern Tibetan at 500 hPa have significant relations with the South China-Jianghuai precipitation pattern, which are all negative with South China precipitation but positive with Jianghuai precipitation; Q1 of the northern Tibetan at 200 hPa and eastern Tibetan at 500 hPa have negative relation with the middle-lower Yangtze River precipitation pattern, while for summer western Tibetan at 500 hPa, it is positive. Q1 areas discussed above can provide significant basis for summer precipitation forecast in eastern China. Summary from the relevant characteristics between Q1 and summer precipitation centers shows that Q1 in spring over Tibetan can affect the location distribution of summer rain belts in eastern China. The heat-pump effects of the Tibetan from spring to summer lead to the water vapor transport from the southeastern Tibetan to the eastern China. When the heating is strong, the streng thening northern transportation-component of water vapor creats' North wet-South dry' pattern; in the contrary, the weak transportation of water vapor to the north tends to provide' North dry-South wet' pattern.