The difference of tree growth and fruit quality between kumquat grafted on kumquat and kumquat seedling tree,sour tangerine and trifoliate orange were investigated in 2 years of Yangshuo in Guangxi.Results show that the stock is different,the kumquat tree growth and fruit quality also is different.The seedling tree growing upstanding produced the least fruits,had the smallest vertical and transverse diameter and fruit weight,the thickest peel,the highest total soluble solids (TSS)/titratable acid (TA) ratio and the lowest titratable acid content.Fruits on kumquat had the biggest transverse diameter and fruit weight,the worst peel brightness and the lightest color,vitamin C content and the lowest TSS.Trees on trifoliate orange showed the the thinnest peel,worst compatibility between scion and rootstock,the lowest edible rate,the highest TA content.Trees on Sour tangerine growing vigorously produced the deepest color,had the most fruits and the best fruit quality,the highest TSS,edible rate and Vc content,the best of peel brightness.Judged by overall performance,sour tangerine is the right stock to Yangshuo kumquat,could be applied in production.