Objective:To optimize the formula of metronidazole and borneol sustained-release films. Methods: The mass ratio of Rhizoma Bletillae polysaccharide and polyvinyl alcohol 124(PVA-124) and the dosage of glycerol and sodium carboxymethyl cellulose ( CMC-Na) as the influencing factors ,the appearance of films and the release rate of metronidazole at 0. 5h and 4h as the comprehen-sive evaluation indices, the formula of the film-forming materials was optimized by orthogonal test. Results:The mass ratio of Rhizoma Bletillae polysaccharide and PVA-124 was the key factor affecting the quality of the films. When the mass ratio of Rhizoma Bletillae pol-ysaccharide and PVA-124 was 20∶80, and the dosage of glycerol was 3. 5g and that of CMC-Na was 0. 14g, the appearance of the films was satisfied, the release rate of metronidazole at 0. 5h and 4h was 25. 17% and 69. 64%, respectively, and the average cumulative re-lease rate at 8h was over 90%. Conclusion:The films prepared by the optimized formula are flat, smooth, clean and moderately soft, which can not only remain the drug release characteristics of the films made by the original formula, but also exhibit the pharmacologi-cal effect of Rhizoma Bletillae.