The 16-year-old satsuma mandarin (Citrus unshiu Marc.) planted on an acid yellow brown soil of Yiling district in Yichang city was used as experimental materials,effects of liming on improving soil acidification,plant nutrient absorption and fruit quality of satsuma mandarin were studied.The results showed that application of 1.5 kg/tree lime could increase soil pH in 0-20 cm,20-40 cm and 40-60 cm soil layer by 0.87 units,0.99 units,0.47 units,respectively.Liming could significantly increase soil available N,P,Ca,Mg contents by 30.82%,71.13%,64.06%,14.27% in 0-20 cm soil layer and improve the foliar N contents and pulp K contents.Soil available Fe,Mn,Zn contents decreased by53.61%,54.83%,51.06% in 0-20 cm soil layer,leading to the decline of foliar total Fe,Zn contents and peel,pulp Mn contents.Moreover,liming could reduce fruit acidity,improve fruit quality.Therefore,rational application of lime could increase soil pH,soil available N,P,Ca and Mg contents,alleviate Mn toxicity,and then improve citrus plant nutrition and increase fruit quality of satsuma mandarin in a viscous yellow brown soil with serious acidification.