[Objective] The theoretic basis and new approach of the development and utilization of essential oil of orange peel was provided through the improvement of the traditional technique of its extraction.[Method] The extraction time,pressure,temperature and CO2 flux and other factors affecting the extraction efficiency in the method of microwave and supercritical CO2 the extract of essential oil from orange peel was discussed and the extracting process was optimized with the orthogonal experiment.[Results] The ...