Abstract: In order to develop a new natural tobacco flavor,the concrete of peels of Citrus grandis(L.) Osbeck was made by accelerative solvent extraction(ASE) under the pressure of 10.34 MPa at 100℃,and the volatile constituents in the concrete were analyzed by gas chromatography-mass spectrometry(GC/MS).The concrete was pyrolyzed in helium atmosphere at 300,450,600,750,and 900℃ separately,and pyrolyzates were analyzed by on-line pyrolysis-GC/MS,and the concrete was evaluated as a cigarettes flavoring.The results showed that:1)53 volatile constituents were identified in the concrete,and most of them were terpenoids,alcohols and esters;2)23,30,35,50,and 55 volatile constituents were identified in the pyrolyzates at 300,450,600,750 and 900℃,respectively;3) the most constituents in the concrete were not detectable in the pyrolyzates at 300℃,only part of furfural,cis-linalool oxide,trans-linalool oxide,carvone and palmitic acid remained until the temperature reached 600℃.At 600℃,the pyrolyzates were mainly aldehydes,ketones,esters and funans;benzene and PAHs emerged and their contents increased with the rise of temperature.Above 600℃,the major components were benzene and PAHs;4) the concrete improves and modifies the smoking taste of cigarette,enhances smoke flavor,and reduces irritation.