The main component was L-menthol with a content of 62.3%~87.2%;In the swirl of menthone (menthone) etc。Also contains flavonoids: isoraifolin (isoraifolin), mentho side;Organic acid components: rosmarinicacid, caffeic acid;Amino acid components: asparticacid, glutamic acid [3]。It also contains dicarboxyl-1,2-dihydronaphthene dicarboxylic acid is a variety of components of the parent nucleus :1- (3),4 dihydroxyphenyl)-6,7-dihydroxy-di-1,2-dihydrotea-2,3-dicarboxylic acid (1- (3,4-dihydroxyp henyl)-6,7-dihydroxy-l,2 - dihydronaphthalene - 2,3-dicarboxylic acid], etc