To study the chemical constituents of the twigs of Artocarpus.Pithecogallus.Methods：Compounds were isolated and purified by the normal phase silica gel,MCI gel,Sephadex LH-20,HPLC and ODS chromatography.Their structures were identified by comparing the 1H-NMR and 13C-NMR data with those reported in literature.Results：Six triterpenoids were isolated from the ethyl-acetate fraction in 95% ethanol extract of A.Pithecogallus.All isolates were identified as 3,25-dihydroxy lanolin-8,23(E)-diene-7,11-dione(1),(24R)-cycloalkane-25-ene-3,24-diol(2),(24R)-cycloalkane-24,25-diol-3-one(3),ursolic acid(4),birch acid(5）and betulin(6).Conclusion：Compounds 1,5 and 6 were isolated from the genus Artocarpus for the first time.