Abstract: In order to expand the application of Radix platycodonis polysaccharide and broaden the slection for edible film materials，polysaccharide composite film was prepared by sheet glass flow casting，and the preparation conditions was optimized through response surface analysis. By using tensile strength as the evaluation indicator，the best preparation conditions were found as：Radix platycodonis polysaccharide 2.16%，sodium alginate 2.66% and glycerin 1.88%，from which the tensile strength of the obtained composite film was 7.875 MPa. By using folding endurance as the evaluation indicator，the best preparation conditions were found as：Radix platycodonis polysaccharide 2.04%，sodium alginate 1.92% and glycerin 1.97%，from which the folding endurance of the obtained composite film was 167 double fold. With Radix platycodonis polysaccharide 2.0%，sodium alginate 1.8% and glycerin 2.0%，the obtained composite film had the best balanced properties with tensile strength of 7.875 MPa and folding endurance of 167 double fold.

摘要： 为了拓展桔梗多糖的应用领域及可食膜材料种类的单一性，利用玻璃板流延法制取多糖复合膜，采用响应面分析，研究了复合膜的制备配比，并测定其性能。结果表明：以抗拉强度（TS）为评价指标，复合膜的最佳配比条件为：桔梗多糖含量2.16%、海藻酸钠含量2.66%、甘油含量1.88%，此优化条件下的抗拉强度为7.875 MPa；以耐折度（FE）为评价指标，复合膜的最佳配比条件为：桔梗多糖含量2.04%、海藻酸钠含量1.92%、甘油含量1.97%，此优化条件下的抗折度为167双折次。比较后，在多糖、海藻酸钠、甘油含量分别为2.0%、1.8%、2.0%的条件下，TS为7.875 MPa、FE为167双折次，综合指标最好。