The developing process of hygienic standard for palm olein was reported. It included: the characteristic in composition of palmitoleic acid; the technological and hygienic problem in production process; comparison with CODEX STAN 125-1981 frormulated by Codex Alimentarius Commission(CAC) of FAO/WHO, Malay hygienic standard of palm olein (MS817-89), and Chinese hygienic standard of refined oil. It provides executive bases for safety control and inspection of palm olein on national markets and trading ports.