Using the ocean temperature of Northwest Pacific and the precipitation in summer of Hunan,the interconnection between Kuro-shio from last autumn to last winter and the precipitation and flood in summer in the Dongtinghu area were analysed.The results show that the interconnection between the Kuro-shio in the period and the precipitation and flood in summer in the Dongtinghu area is very outstanding.The anomaly of Kuro-shio is an important background of climate that influences precipitation anomaly and flood in summer in the Dongtinghu area.