Abstract: Temperature is one of basic factors to influence the growth and development of crops, and decides the length of growing period. The relationships between the length of rice growing period and temperature are analysed by using data of rice ecological experiment. The results show that during rice growing period, when mean temperature rises 1℃, the days of growing period decreases 7.6 days. According to experts’ prediction, air temperature will rise 1~4℃, due to warming climate, which makes the growing period of single cropping rice and early rice in China shorten. The isogram of the date of growing period in the eastern China will remove northwards, 1~5 degrees latitude in Northeast China, 3~6 degrees in the Huang-Huai-Hai Plain. The growing period’s getting shorter can be mitigated by taking following measures: adjusting the planting season, selecting appropriate rice ecological types and regulating temperature with water