[Objective]To further understand the type and content of phenol in Magnolia sieboldii K. Koch. [Method]High performance liquid chromatography( HPLC) was used to qualitatively and quantitatively measure the free phenol,combined phenol and ester phenol in leaves. [Result] Among the four detected phenol,M. sieboldii leaves contained two free phenols( coumaric acid and chlorogenic acid),four combined phenols( caffeic acid,coumaric acid and catechin,coumarin) and two ester phenols( coumarin and coumaric acid). V...