Abstract: In order to select the suitable concentration of organic selenium and improve the quality and yield of melons and vegetables,eggplant,sweet potato（Ipomoea batatas）and melon were sprayed with different concentrations of organic selenium nutrient solution(1 000 and 1 500 mL·667 m^-2)on their leaves to determine the fruit characters,nutritional indexes and yield of the tested melons and vegetables.The results showed that the yield of eggplant,sweet potato（Ipomoea batatas）and melon were increased by spraying organic selenium on leaves.The yield of eggplant increased significantly by spraying organic selenium at 1 000 mL·667 m^-2,but the yield of sweet potato（Ipomoea batatas）and melon had no significant difference among different application rates;foliar spraying of organic selenium could significantly increase the VC content of melon and vegetable crops,the soluble solid content of melon,and the crude protein,dry matter and reducing sugar content of sweet potato（Ipomoea batatas）;the enrichmental effects of organic selenium in three kinds of melon and vegetable crops was melon＞ eggplant and sweet potato（Ipomoea batatas）,1 000 mL·667 m^-2 of organic selenium was better for eggplant and sweet potato（Ipomoea batatas）,and 1 500 mL·667 m^-2 for melon.