Objective: To optimize extraction process of volatile oil from Clerodendrum mandarinorum leaves

and analyze its chemical components. Method: On the basis of single factor tests

the amount of water

soaking time

distillation time and ultrasonic time was optimized by orthogonal test.Chemical components in volatile oil were analyzed by GC-MS

the relative content of each component was determined by peak area normalization method. Result: Optimum extraction technology conditions were as follows:soaked in 12 times the amount of water for 12 hours

distilled for 10 hours

ultrasonic time of 80 min.Yield of volatile oil was 0.332%.Fifty-nine compounds were separated and fifty-three of them were identified accounting for 95.14% of the total content.Chemical components were 1-octen-3-ol(19.020%)

linalool(12.981%)

phytol(11.768%)

2-hexenal(9.911%)

alpha-pinene(6.681%)

whose relative mass fractions were greater than 5%. Conclusion: Orthogonal test can accurately select extraction process of volatile oil from C. mandarinorum leaves

this process is reasonable with high efficiency.Main components of volatile oil are aliphatic hydrocarbons

terpenes and their derivatives.