OBJECTIVE： To establish a method for analyzing the volatile constituents of different parts（root， stem and leaf） of Mentha haplocalyx. METHODS： HS-GC-MS was performed. GC conditions： the column was HP-5MS capillary quartz column， carrier gas was He （constant current mode）， flow rate was 1.0 ml/min， volume injection was 1.0 μl， inlet was split mode with split ratio of 10 ∶ 1， temperature was 250 ℃ （temperature programmed）. MS conditions： ionization source was electron bombardment， energy was 1 905 V， temperature was 230 ℃， quadrupole temperature was 150 ℃， and the scanning range was m/z 30-550. RESULTS： Totally 10，14 and 48 volatile components were identified from the root， stem and leaf， which accounted for 90.03％， 92.79％ and 95.93％ of the capacity of the total essential oil from each part of it. And totally 51 volatile compounds was identified， including 7 kinds that shared the same chemical components that regard the piperitone oxide as the main ingredient. CONCLUSIONS： The method is simple， stable and reproducible， and can be used for the analysis of volatile components of different parts of M. haplocalyx. The volatile components in different parts are quite different， and most is in the leaf.