Abstract: In order to master the law of accumulation of nutrient elements in garlic（Allium sativum L.） in alkaline selenium-rich soil area and provide support for high-quality development of garlic industry, based on the synergistic monitoring of garlic and soil in the eastern Qinghai-Tibet Plateau, nine indexes of Se, Fe, Sr, Mg, Cu, Zn, Mn, Cr and I were analyzed, and quality evaluation was carried out by using characteristic parameters, enrichment coefficient and nutrient level. The results showed that the average content of Se, Cu, Zn, Fe, Mg, Mn, I, Sr and Cr in garlic was 43.6 μg/kg, 2.10 mg/kg, 7.56 mg/kg, 0.017 g/kg, 0.27 g/kg, 3.33 mg/kg, 0.035 mg/kg, 2.6 mg/kg and 0.06 mg/kg, respectively. The garlic grown in selenium-rich soil（soil Se≥230 μg/kg） reached the selenium-rich level. The transport enrichment ability of Se, Zn and Cu in garlic was the strongest, the ability of Mg, I and Sr was moderate, and the ability of Mn, Fe and Cr was the weakest. Garlic had the ability of synergistic enrichment of Se, Cu, Zn, Cr and other nutrients. The contribution rate of Cu, Fe and Mn to the nutrients of the human body was the largest, the next was Se, and the lowest was Zn and I.

Key words: alkaline selenium-rich soil, garlic（Allium sativum L.）, nutrients, enrichment coefficient