Essential oil of camphortree leaves extracted with ultrasonic enhancement of supercritical CO2 and the preparation technology was optimized with orthogonal experiment.The research showed that the new process could get a better result as the extraction pressure was 16 MPa,temperature was 50°C,extraction time was 80 min,CO2 flux was 16 kg/h,ultrasonic power was 240 W and ultrasonic frequency was 20KHz,the average yield of essential oil of camphortree leaves was 1.92%.The analysis of GC-MS indicated that the content of camphor andβ-linalool was ...