Abstract:Five triterpenoids were isolated from Isodon oresbius.Their structures were identified as ursolic acid,2α,19α-dihydroxy ursolic acid,2α,3α,19α-trihydroxy-12-ursen-28-oic acid,2α-hydroxy oleanolic acid and-2α,23-dihydroxy oleanolic acid by physico chemical constants and spectral analysis.