Abstract: The distnburion patterns of correlation between the summer precipitation in the Southeast China and the latent heat flux(LHF)over the South China Sea(SCS)in the preceding winter, spring and simultaneous summer are analyzed by use of the singular value decomposition(SVD) and the empirical orthogonal function(EOF), the "key regions" are found from the distribution patterns, the reliability of the high correlation regions are discussed. The results show that there exists close relationship between the summer precipitation in the Southeast China and the LHF over the SCS, especially the higher correlation between the LHF in the preceding spring and the simultaneous summer and the precipitation. There is apparent negative correlation between the LHF over the northern SCS in the preceding winter and the summer precipitation in South China and its coastal regions. In spring a strong positive correlation between the LHF over the middle SCS and the precipitation in the area from the south of the Changjiang River to South China coastal regions is found. In summer, the "key region" still exists over the middle SCS and has influence on precipitation in the corresponding period.