Objective : To prepare hydroxypropyl -β - cyclodextrin ( HP - β - CD) inclusion complex of methyla- ted 4 -hydroxy resveratrol. Methods:The inclusion compound was prepared with the method of"solution -stirring", and its inclusion rate and water solubility was measured by the untraviolet (UV)scanning and infrared (IR) spectrum. Results : The HP - β - CD inclusion complex of methylated 4 - hydroxy resveratrol was prepared success- fully by using the method of solution - stirring. The inclusion complex improved the water solubility o...