In order to reveal the change rules of thermal resources and climatic potential productivity of single season rice in Jiangsu province under climate change scenarios,based on daily meteorological data from 1971 to 2000 in Huang-Huai- Hai region combing with daily meteorological data from the regional climate model RegCM3,the meteorological data of Jiangsu province was extracted,and the spatial and temporal variations of the characteristics of thermal resources and climatic potential productivity of single-season rice in Jiangsu province under RegCM3 from 1951 to 2100 were analyzed. The results showed that: ① The accumulated temperature above 10 ℃ increased gradually from northeast to southwest over time. The optimum sowing date(the first day for the daily temperature to steadily pass 10 ℃) of single-season rice advanced gradually over time and delayed gradually from southwest to northeast. The length of single-season rice growth season was shortened gradually from northeast to southwest from 1951 to 2010,and was shortened as well from southeast to northwest from 2011 to 2100. and ②With the increase of thermal resources,the climatic potential productivity of single-season rice in Jiangsu province showed a low-high-low trend over time and decreased gradually from southwest to northeast,and the southwestern of southern Jiangsu province yielded the highest.