Abstract: From an ethanol extract of Euphorbia micractina roots, sixteen terpenoids were isolated by a combination of various chromatographic techniques, including column chromatography over macroporous resin, silica gel, and Sephadex LH-20 and reversed-phase HPLC. Their structures were elucidated by spectroscopic data analysis as loliolide myristate (1), 24-methylenetirucall-8-en-3β,11α-diol-7-one (2), loliolide (3), 3β-hydroxy-5α,6α-epoxy-7-megastigmen-9-one (4), jolkinol A (5), jolkinol D (6), latilagascene F (7), helioscopinolide A (8), helioscopinolide B (9), 3-O-acetylhelioscopinolide B (10), helioscopinolide D (11), helioscopinolide E (12), (+)-11-acetoxyatis-16-en-3,14-dione (13), erythrodiol (14), uvaol (15) and betulin (16). All of the compounds were obtained from this plant for the first time, in which 1 and 2 are new compounds.