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According to the climatic datas about 101 stations of Hunan province from 1951 to 1980,and the datas hour by hour from part of observational stations in Hunan, in climatic and meteorologial term,in macroscopic and microcosmic term,this paper analyses the effect of Dongting Lake on the temperature,coming out: 1.The effect of Dongting Lake on the daily variation of air temperature is very obvious,Yueyang is by the east of the Dongting Lake,its daily maximum temperatures appear at 17 in average,even meteorologists in the lake district have not perceived this definitely before;2.The extreme maximum temperature of Dongting Lake district is lower than surrounding regions,and its extreme minimun temperature is higher than surrounding regions;3.The mean annual maximum temperature of Dongting Lake is lower than surrounding regions,and its mean annual minimum temperature is higher than surrounding regions,the data is about 1 ℃ ;4.The daily range of temperatures of Dongting Lake are smaller than other regions in Hunan province;5.The high-temperature days and low-temperature days of lake district are fewer than others.