Abstract: Effects of sodium borate,potassium sulfate,manganese sulfate,magnesium sulfate,zinc sulfate and cobalt sulfate on nitrate contents in vegetable have been studied by pot experiment with Brassica chinensis .The results showed that nitrate contents in Brassica chinensis decreased by 14.84%-19.56% after application of sodium borate for 20 days,and also decreased significantly by using K、Mn、Mg、Zn and Co.Nitrate content decreased by 18.96% 10 days after application of zinc sulfate and by 21.42% 20 days after application of potassium sulfate.Application rate of the mineral elements showed significant effects on the accumulation of nitrate in Brassica chinensis .