Abstract: Four terpenoids were isolated from the neutral portion of petroleum ether extract of Artemisia annua by several chromatographic methods, such as silica gel, MCI Gel CHP-20, ODS, Sephadex LH-20 and semi-preparative HPLC. Their structures were identified by HR-MS and nuclear magnetic resonance spectroscopy. These compounds were defined as (1S,4S,5R,6S,9R,10R)-4-ethoxy-9,10-dimethyloctahydrofuro-(3,2-i)-isochromen-11(4H)-one (1), 3a,4,5,6,6a,7-hexahydro-3,6-dimethyl-9-methyl-2H-naphtho8a,1-bfuran-2,8(3H)-dione (2), kobusone (3) and 1,2-campholide (4). Compound 1 is a new compound, of which the absolute configuration was established by single crystal X-ray crystallographic analysis. Compound 2 is a new natural product. Compounds 3 and 4 are first isolated from the Artemisia genus.