Objective: To develop a method for determination of limonene with GC- MS,can be used for the identification of hogwash oil. Method: The oil sample dissolved with hexane was distilled,collecting the distillate and detected by GC- MS. Results: The linear range of the limonene was found to be 0. 005 ~ 1. 0 mg / L,and the correlation coefficient of the standard curve were 0. 9995. The limit of detection was 1. 0 ng / kg. The recoveries of limonene for the spiked samples ranged from80. 3% to 89. 5%. The method w...