Two different rootstock materials,pumpkin and gourd,were grafted onto watermelon varieties,and effects of grafting on watermelon fruit quality were studied by comparing grafting and non grafting treatments.Results showed that,different rootstock graft-ing had significant effects on watermelon yield,plant growth and development,and fruit quality.Grafting pumpkin rootstock could sig-nificantly improve yield and fruit quality of watermelon,increase content of lycopene and soluble sugar in the fruit,and improve root de-velopment and mineral nutrient absorption of the plant.This study could provide theoretical basis and technical guidance for efficient cul-tivation of watermelons.