Abstract: Based on the foundational principle of extraction with supercritical fluid, this paper ascertained the principal factorsaffecting the extraction of wheat germ oil with supercritical CO2 fluid . These were extracting pressure ,extractingtemperature,extracting period ,carbon dioxide flow rate ,water content of wheat germ and its granule size etc. The optimalworking parameters were worked out via orthogonal extracting experiments (tests) and single factor experiments (tests).These were 32～36 MPa of extracting pressure ,45～50℃ of extracting temperature ,6 hours of extrating period ,20kg/h ofCO2 flow rate and 5.0 % of water content of wheat germ.

Key words: Wheat germ oil , Supercritical CO2 fluid(SCF- CO2) , Extraction , Optimal condition.