Abstract: In order to choose the best treatment on berry quality of ‘Summer Black'grape,four kinds of combined reagents including Baoguoyou′and Guoshimei′,ABA and Baoguoyou′,Guoshimei′and Nongjiufu′,ABA and Haijingling′were used one week before the turning-color period.Meanwhile,clear water was used as control.The results showed that four treatments improved the fruit color,total sugar content,sugar acid ratio and soluble solids content,but reduced the titratable acid content.In the contrast,they had no significant influence on the berry length and width,average berry weight and vitamin C content.Our results indicated that the effect of Guoshimei′and Nongjiufu′treatment was better than the others.