Based on the fact of frequent drought disaster and influence rising in south China with the climate changing, the precipitation and temperature data of month in Gaoyou weather station in the recent 65 years(from 1951 to 2015)were collected, using the standardized precipitation evaporation index(SPEI)and the method of Mann-Kendall(MK)trend test, to research and analyze the drought incidence, influence degree and change law in each growth stage of rice. The results show that the incidence of light drought is maximum in the whole growth stage, meanwhile the biggest probability of light drought is in turning green stage and that of heavy drought is in the jointing-earing stage. Since the 1970s, the times of drought growth stage have being on the rise and between 14% and 28% and they are more. With the time distribution characteristics of SPEI, the turning green stage, tillering stage and jointing-earing stage have shown an upward trend, the milk stage and maturing stage have shown a downward trend, so it can be known that the drought degree at the milk stage shows a strengthening trend, that at the turning green stage, tillering stage and jointing-earing stage shows a decreasing trend. The trend detection shows that except that the jointing-earing stage had a very significance level and the milk stage had a significance level, the others were below the significance level. The results can effectively guide resisting drought and irrigation and provide reference to impact assessment of drought disaster in the key water requirement growth stage of rice, so as to make irrigation decision as early as possible and avoid the reduction of rice crop by drought.
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