Abstract: Paddy soil and low temperature is one of the normal stresses in rice cultivating area of China,therefore an investigation on the tolerance capacity and field performance of rice of different genotypes in paddy and low temperature field,has theoretical and practical meanings.Rice varieties which are normally cultivated in Sichuan Basin were observed in fields,the number of rice tillers,panicle traits and other agricultural traits of rice in paddy and law temperature field were measured and analyzed.The results showed that under paddy and low temperature environment,① Xieyou 027 and Gangyou 188,with higher tolerance index,had more tillers and lower height increasing index during tillering stage than other varieties.The maximum tillers numbers were 24.93 and 23.90 respectively and the mean height increasing index were 5.2 % and 5.7% respectively.② Setting rates of Xieyou 027 and Gangyou 188 decreased by 5% and 2%; panicle length of Xieyou 027 and Gangyou 188 decreased by 0.8% and 0.1% respectively; the decreasing rates were all significantly lower than that of other genotypes.③ the rice yield of Xieyou 027 and Gangyou 188 was 7.16 t/hm2 and 6.61 t/hm2 respectively,which was much higher than Fuyou151(4.81 t/hm2)and Chuanguyou 204 (3.43 t/hm2).④ Correlation index between rice yield and tolerance index was 0.64(P0.05),correlation index between reduced rice yield and tolerance index was -0.78(P0.01).With higher capacity to tolerate the low temperature and paddy soil environment，Xieyou 027 and Gangyou188 have more tillers than that of other rice varieties during tillering stage,and its decreasing rates of panicle length and panicle grains were less than that of other rice varieties,therefore,the yield was higher than other rice under low temperature and paddy soil environment.Tolerance index of paddy and low temperature can be used to measure the capacity of rice to tolerate paddy and low temperature stress,a higher value means less reduced yield under paddy and low temperature environment.