Abstract: The chemical components of the volatile oil of Pinus prokoraiensis needles were analyzed by GC/MS. There are eighty-eight peaks of compounds separated on the gas chromatograph, and identified by MS database. Fifty-two compounds, mainly including monoterpenes and sesquiterpenes, and small ambuuts of alcohols, esters, aldehydes, ketones, and phenols derivated from terpenes, had the relative content of over 0.1%. Pinus prokoraiensis was verified as a new species of plant by comparing the chemical components of volatile oil of Pinus prokoraiensis with that of Pinus koraiensis.

Key words: pinus prokoraiensis, pinus koraiensis, volatile oil, identification