Objective: The component of the volatile oil from Leucaena leaves was analyzed by GC-MS. Twenty-six compounds were identified. The main constituents were phytol,n-hexadecanoic acid, 6,10-dimethyl-5 , 9-undecadien-2-one, octacosane, Nonanal, Docosane, 15-tetracosenoic acid,methyl ester and so on.