Abstract:Pot experiments were carried out by using two types of paddy soils (yellow paddy soil and red paddy soil) and nine rice varieties to study the effects of cultivar on their tolerance and accumulation for Pb and Hg pollution. The results indicated that the yields of all rice varieties reduced significantly when spiked with Pb. The reduction of yield ranged from 3.6% to 29.8% in red paddy soils and from 2.3% to 16.9% in yellow paddy soils. For Hg pollution treatment, the yields of 9 varieties reduced slightly with no significant difference. There was a significant difference in the tolerance to Pb and Hg among 9 rice cultivars. For Pb treatment, the reduction of yield for Ningjing 1 was the least, which indicated that it’s highest tolerant to Pb, while the reduction of yield for Tianxie 6 was the largest, which showed that it’s least tolerant to Pb. For Hg treatment, Ningjing 1 was the highest tolerant to Hg while Zhe 1500 was the least. Different rice cultivars showed a significant difference in accumulation capacity of Pb and Hg. Tesanai 2 had the highest bioconcentration factor(BCF) of Pb, which indicated it’s most sensitive to Pb, while Zhe 1500 had the highest BCF of Hg, which indicated it’s most sensitive to Hg contamination. Ningjing 1 had the lowest BCF of Pb and Hg, which showed it’s least sensitive to both Pb and Hg contamination. Rice cultivar, soil type and pollution type differed in their effects on the tolerance of rice for Pb and Hg pollution, they contributed seperatly 36.5%, 18.3% and 27.1% of the total varitaion, respectively.