Based on the 1960 -2010 daily meteorological data from 12 rice observation statipns in Jiangxi Province, variation cbaracleristics and trend forecast of precipitation, temperature and sunshine suitability for double-cropping late rice were analyzed by using Morlet wavelet function. The results indicated that the suitability of precipitation was low, but the suitability of temperature and sunshine was relatively high, which explained that the lack of natural precipitation was a restraints to the yield of double-cropping late rice, the temperature and sunshine could satisfy the growth and development of double-cropping late rice. But it must be noted that the sunshine suitability took a significant drop trend, especially in the 1970s and 1990s. The precipitation suitability showed quasi - 1 la and quasi -22a cycles with widespread region, which were strengthened recently; the obvious cycles of temperature suitability were quasi-17a and quafli-7a, and sunshine suitability were quasi-26a. It is estimated that precipitation suitability would keep at a low level until 2015, the temperature Mutability would lend to be normal or in a weak period in 2012 - 2021, and the sunshine suitability would be strong in the next seven yean.%选取江西省12个水稻观测站1960 ～2010年逐日气象数据,利用Morlet小波函数分析了近51年来江西省双季晚稻降水、温度和日照适宜度的变化特征和趋势.结果表明:降水适宜度低,温度和日照适宜度较高,说明在晚稻生长季内,自然降水偏少是江西省晚稻产量形成的主要限制因素,温度和日照一般能满足晚稻的生长发育,但需要注意的是,日照适宜度总体呈下降趋势,且下降趋势比较显著,尤其是20世纪70、90年代.降水适宜度存在准11、22年的周期振荡,它们具有全域性,近期信号加强；温度适宜度最明显周期是准17、7年；日照适宜度最显著周期为准26年.预计2010年以后的一段时间内降水适宜度总体仍然偏低,一直持续到2015年；温度适宜度在2012 ～2021年将趋于常年或处于偏弱期；日照适宜度在接下来7年内将处于偏强期.
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