The changes on components and content of organic acids in the fruits of Pyrus pashia Buch.-Ham.,P.calleryana Decne,P.betulaefolia Bunge and the‘Hosui'pear grafted on them were compared with HPLC analysis to study the effects of rootstocks on metabolism of organic acid of their scion varieties.The results showed that the varieties of organic acids in the fruits of rootstocks and their scions were similar,including oxalic acid,quinic acid,malic acid,citric acid and shikimic acid.Organic acid metabolism of‘Hos...