Abstract: In this experiment, we studied on the effects of grafting on development, carbohydrate content and sucrose-metabolizing enzymes activities of muskmelon fruit in solar greenhouse. The results showed that the enlarging speed of fruit had been quickened, and little effects on mesocarp thick of muskmelon fruit. By grafting, Fructose and glucose content of mesocarp of muskmelon fruit decreased, and the pattern of sucrose accumulation was also changed by grafting, the schedule of sucrose accumulation bringing forward about 7 days compared with the own rootmuskmelon, and sucrose content of mesocarp of muskmelon fruit was also higher than it. But total sugar content, acid invertase (AI) and netutral invertase (NI) activities of mesocarp of muskmelon fruit declined, sucrose phosphate synthase activities and sucrose synthase activitieswere evidently improved by grafting.

Key words: Muskmelon, Grafting, Carbohydrate, Sucrose-metabolizing enzymes