Abstract: In this paper, seven tartary buckwheat varieties including Qianheiku 1, Qianku 2 to 7 planted in Weining County, Guizhou were used as experimental materials to investigate the differences of enrichment capacity of cadmium（Cd）, arsenic（As）, Lead（Pb）, Nickel（Ni）, copper（Cu） and zinc（Zn） in soil, and the pollution of tartary buckwheat by various heavy metals was evaluated based on the Nemerow comprehensive pollution index method, and the varieties with low accumulation of heavy metals were screened. The results showed that the enrichment ability of tartary buckwheat grains to heavy metals varied with different elements, and the overall pattern was Cd＞Zn＞Cu＞Ni＞Pb＞As. The grains of seven tartary buckwheat varieties were seriously polluted by Cd, with the single contamination index（P_i） ranging from 2.19 to 3.8, and the contamination levels were all high. The yield of tartary buckwheat was mainly affected by the content of Pb in seeds, and the Pearson correlation number was-0.665, which reached a strong negative correlation. There was a significant positive correlation between Zn, Ni and Cu contents in grains, and the Pearson correlation coefficients were 0.775 and 0.802, respectively. Tartary buckwheat 3 was a low accumulation variety of Cd, while tartary buckwheat 7 was a low accumulation variety of As, Ni and Pb. Additionally, tartary buckwheat 5 was a low accumulation variety of Cu, while tartary buckwheat 4 was a low accumulation variety of Zn.