Objective:To analyze and compare the volatile constituents which were extracted from the differ-ent parts of Picrasma quassioides.Method:The volatile components were extracted from the different parts of P.quassioides by the methods of MAE-HS-SPME and the chemical components of them were identified by GC-MS and Kovats retention index.Result:Eight-four volatile constituents in the petiole

76 in the leaf blade and 60 in the branch of P.quassioides were separated and identified

Accounting for 97.247%

97.179% and 97.141% of the to-tal peak areas

respectively.Which is the main component in petiole carvacrol（5.201%）

thymol（6.185%）

trans-caryophyllene（6.562%）

alpha-bergamotene（6.295%）

trans-beta-farnesene（5.088%）

cuminol（10.807%）

beta-bisabolene 6.136%).And in the leaf blade trans-caryophyllene（7.017%）

alpha-bergamotene（7.848%）

trans-beta-farnesene（8.297%）

cuminol（10.728%）

beta-bisabolene（7.150%）

（-）-caryophyllene oxide（5.094%）.And in the branch trans—caryophyllene（5.530%）

alpha-bergamotene（9.997%）

trans-beta-far-nesene（7.994%）

cuminol（15.416%）

beta-bisabolene（12.733%）.Conclusion:Contain volatile components in the petiole

leaf blade and branch three parts of P.quassioides are quite different.