Abstract:Field and pot experiments were conducted in 2018 to compare the changes in indicators of nine mid-season hybrid rice varieties including average growth period,yields,average light energy production efficiency,average cumulative temperature production efficiency,ratooning ability,greenhouse gas emissions and heat tolerance during flowering period. The membership function method was used to comprehensively evaluate the adaptability of the tested varieties in the climate warming and ratooning ability in the middle and lower reaches of the Yangtze River. The results showed that there were obvious variations in the seven agronomic and ecological traits. According to the average values of subordinate functions,four mid-season hybrid rice varieties with moderate growth periods,high yields,high light and temperature production efficiencies,low greenhouse gas emissions,strong heat tolerances at flowering stage and good ratooning abilities were selected:C Liangyou Huazhan,Liangyou 6326,C Quanyou Huazhan and Longliangyou 3188. Liangyou 6326,C Liangyou Huazhan and Quanyou Huazhan are suitable for cultivating as ratooning rice with good potential popularization value in the middle and lower reaches of the Yangtze River. However,Longliangyou 3188 with high yield,strong heat resistance and the growth duration of 140 days should be sowed early as ratooning rice. Large-scale cultivating these four varieties selected as ratooning rice will mitigate the adverse effects of rice production on climate warming in the middle and lower reaches of the Yangtze River.