Rainwater temperature differences of natural and seeded clouds are analysed using method of atatistical and some ceaes based on the data of rainwater temperature, environmental air temperature, rain amount and data of radar echoes from 1989 to 1990. The results are: 1)the rainwater temperatures of seeded cumulus are lower than that of natural ones. The mean of the differences is 0. 8℃ ,2)rainwater temperatures of most seeded cumulus are lower than the environmental, air temperature. The mean value of difference between both is 2. 0℃ and the maximum is 2. 3℃.