The effects of zinc on yield and quality of two kinds of eggplants (black-purple eggplant and bamboo eggplant) were studied to provide scientific base for reasonable trace element fertilization in quality vegetables planting. The results showed that the yield of these two kinds significantly improved adding the rate of zinc from 10 to 40 mg/kg, the yield reached maximum while the zinc in soil was 20 mg/kg.Meanwhile, the yield of black-purple eggplant increased by 37.7% and bamboo eggplant increased by 82.5%, respectively. The content of free amino and nitrate in the two kinds of eggplants declined, and the content of soluble sugar, vitamin C, flavone, rutin and some mineral elements like zinc, iron and calcium increased with the increase of concentration of zinc in soil. Most quality elements in eggplant reached maximum while zinc in soil was 20 mg/kg, the next were 40 and 10 mg/kg. Adding appropriate zinc fertilizer into soil which short of zinc(zinc in soil was 20 mg/kg)could significantly improve eggplants' quality, but the rate of zinc beyond of 40 mg/kg, the quality of eggplants went down.