Abstract: An analysis of June precipitation in 38 stations of Henan province from 1958 to 2006 has shown that the 1st mode of EOF is consistently distributed across the whole province. Therefore the averaged precipitation in the 38 stations is used to represent the amount for the whole province. The drought years and flood years are selected to calculate the anomaly composite field. During the flood years, there are negative latent heat anomalies over the northern Pacific Ocean and in the south of Japan, and positive height anomalies in the north of Baikal, the east and offshore areas of China and over the northern Pacific Ocean on 500 hPa and 850 hPa; there is anomalous northeasterly in the west of Henan and anomalous southwesterly in the east of it. By defining an index for the geopotential height, a 500 hPa height field mode, which has close relationship with the precipitation in early summer, is determined. That is to say, a strong high ridge in Baikal coexists with a weak East Asian trough and a northward-than-normal subtropical high in the western Pacific Ocean. Correlation analysis of the oceanic elements indicates that higher precedent SST over the Kuroshio Extension is accompanied by persistent transfer of more latent heat from the ocean to the atmosphere and the ocean in the northeast of this area absorbs heat from the atmosphere at a later stage, which leads to the rise of the 500 hPa geopotential height field and is beneficial to the precipitation in Henan province.