Abstract: Field experiment was conducted in this research to study the effects of applying chelate fertilizer and condition fertilizer on biological characters and quality of green Chinese onion of Zhangqiu. The results showed that the biomasses of green Chinese onion in applied chelate fertilizer treatment were higher than those in conventional fertilizer treatment and control treatment during August, September and October, but during November there were no obvious difference on the yields between chelate fertilizer and conventional fertilizer treatments. The plant and welsh-onion stalk heights of chelate fertilizer treatment were higher than those of conventional treatment during the different harvest stages. Chelate fertilizer application could markedly enhance the nutritive quality of green Chinese onion than that of conventional fertilizer, it not only increased Vitamin C content but also deceased nitrate content in welsh-onion stalk. Thus, chelate fertilizer treatment was obviously better than conventional fertilizer treatment under the situation of the same fertilizer rates. In conclusion, altering conventional fertilizer kinds can improve the quality of green Chinese onion.