目的 以木薯淀粉、聚乙烯醇（PVA）和壳聚糖为基本成膜物质，通过添加纳米材料并研究纳米材料分散性，以期改善木薯淀粉/聚乙烯醇/壳聚糖复合薄膜的力学性能与耐水性。方法 通过单因素试验和正交试验，研究纳米材料的分散性对木薯淀粉/聚乙烯醇/壳聚糖薄膜性能的影响。结果 得到纳米SiO2的最佳分散条件，超声功率为240 W，超声温度为50 ℃，超声时间为40 min。在此条件下，复合薄膜的综合评分达到了0.68；对复合薄膜性能影响最大的因素是超声温度，其次是超声时间和超声功率；在一定程度上改善了复合薄膜的力学性能以及耐水性。结论 获得了制备复合薄膜时纳米SiO2的最佳分散条件，为新型复合薄膜材料的开发奠定了基础。

The work aims to improve the mechanical properties and water resistance of cassava starch/polyvinyl al-cohol/chitosan composite films by adding nanomaterials and studying the nanomaterial dispersibility with cassava starch, polyvinyl alcohol and chitosan as the basic film-forming materials. Single factor experiments and orthogonal tests were carried out to investigate the effect of dispersibility of nanomaterials on the properties of cassava starch/polyvinyl alco-hol/chitosan films. The best dispersion conditions for nano-SiO2 were ultrasonic power of 240 W, ultrasonic temperature of 50 ℃, and ultrasonic time of 40 min. Under this condition, the composite film had a comprehensive score of 0.68. The ultrasonic temperature had the greatest effect on the properties of the composite film, followed by the time and power of the ultrasound, which improved the mechanical properties and water resistance of the composite film to some extent. The optimal dispersion conditions for nano-SiO2 are obtained when composite films are prepared, laying a foundation for the development of new composite film materials.