Using Summer Black Grapes growing in plastic tunnel as test material, effects of formulas of differ-ent growth regulators on fruit setting rate and fruit expanding were studied. The results indicated that fruit expand-ing well by using 20% gibberellic acid with 2000 times for fruit retention at the end of full flowering period, and ap-plying Sangaosu with 400 times and 3600 times streptomycin 10 days later. Single grape weights 8.53 g, its color wasbeautiful, its carpopodium was both long and strong, and the grape was long-shaped.