OBJECTIVETo optimize the matrix formulation of cataplasm used to cure infantile diarrhea.METHODSThe optimum proportion of matrix for the preparation technology process of cataplasm was selected by uniform design and SPSS regression analysis. A check-up for adhibition , peeling strength, nonflowing, content of cream was founded.RESULTSThe best matrix's prescription gelatin: CMC-Na: PANA: kaolin: aluminum trichloride: citric acid: PVP K-30: PEG400: trimethylene glycol: tween-80 was 0.25 : 0.1 : 0.2 : 1.5 : 0.4 : 0.6 : 0.8 : 2 : 1 : 0.5.CONCLUSIONThe preparation technique of cataplasm is feasible, and its quality is steerable, it is a safe and effective transdermal-drug delivery system.