OBJECTIVETo filtrate prescription of the adhesive plaster, kind and amount of percutaneous absorption reagent, etc.METHODSIn vitro percutaneous absorption of Xuetie Dingchuan Plaster was studied by HPLC using magnolin as the content of the marker substance, in the condition of equal effective component of samples, drawing graphs with time as abscissa and area of peak as ordinate.RESULTS40% ethanol was used as receptor liquid, prescription with Polyethylene Glycol 6000 as bases, azone as percutaneous absorption reagent. The amount of azone was 1.8%.CONCLUSIONThe prescription of Xuetie Dingchuan Plaster, with 1.8% azone as percutaneous absorption reagent, and Polyethylene Glycol 6000 as bases, is preferable.