Abstract: Objective:To study the extraction technology and properties of essential oil in Citrus aurantiifolia peel,and provide data for the comprehensive utilization of Citrus aurantiifolia peel. Methods:By Citrus aurantiifolia peel as raw materials,crude essential oil was extracted by pressing method. And then it was separated and purified by molecular distillation technology. With total light fraction yield as index,the effects of distillation temperature,scraper speed,feed rate and distillation pressure on the extraction of essential oil in Citrus aurantiifolia peel were investigated. The extraction technology of essential oil from Citrus aurantiifolia peel was optimized by orthogonal experiment and analyzed by GC/MS. Results:The optimum extraction technology of Citrus aurantiifolia peel essential oils were as followed:Distillation temperature 30℃,scraper speed 400 r/min,the feed speed 0.25 L/h,pressure distillation 15 Pa. Finally the total light fraction yield was 76.11%±0.29% and 55 compounds were identified,including limonene(36.585%),gamma-terpinene(12.077%),alpha-terpineol(8.407%),terpinolene(7.867%),alpha-terpinene(5.777%)and others.