Objective: To analysis on the volatile components of Mentha haplocalyx from Baotianman mountan

Banping town and Kaifeng in Henan Province by GC-MS. Method: The volatiles were analyzed by head-space solid micro-extraction

coupled with GC/MS and Kovats. Result: The 21 compounds were identified from the M. haplocalyx collected from Baotianman

29 from the M. haplocalyx collected from Banshanping town and 33 from the M. haplocalyx collected from Kaifeng

81.9%

96.61% and 67.79% of the total volatiles

respectively. The major volatile components of M. haplocalyx collected from Baotianman were caryophyllene oxide (46.59%)

spathulenol (6.79%)

caryophyllene (4.57%) and D-(+)-carvone (3.89%). That collected from Banshanping town were isomenthol (61.1%)

caryophyllene (10.22%)

and menthone (5.64%).That from Kaifeng were pulegone (35.97%)

β-cubebene (5.78%)

isomenthone (5.10%)

piperitone epoxide (4.17%) and menthyl acetate (4.03%). Conclusion: There was a difference in the composition and the rate of composition in the volatile components of M. haplocalyx from three different origin in Henan province.