目的 制备功能更优的包装膜，拓展纳米纤维素−淀粉包装膜的应用，研究超声波−微波协同作用对纳米纤维素−淀粉膜的影响。方法 利用玉米秸秆纳米纤维素(CSNC)和玉米秸秆淀粉(CSS)制备CSNC−CSS膜，并在制备过程中采用超声波−微波协同改性，探究不同超声波−微波协同处理体系对制备的CSNC−CSS膜各种性能的影响。结果 与未进行超声波−微波协同体系处理制备的CSNC−CSS膜进行对比发现，经过超声波−微波协同作用制备的CSNC−CSS膜的各种性能更加优异。其中，膜的抗拉强度由原来的14.92 MPa升至26.46 MPa，提高了约77.35%;断裂伸长率由原来的64.75%升至90.08%，提高了约39.12%;经过超声波−微波处理后，膜的透湿系数和透氧系数均有所下降，分别下降了约25.57%和41.45%，透光量有所增加，溶解时间有所缩短。结论 经超声波−微波协同作用后，CSNC−CSS膜具有更好的力学性能、阻湿性能和阻气性能，具有广阔的市场应用前景。

The work aims to study the effects of ultrasonic-microwave synergistic treatment on nanocellulose-starch film, so as to prepare better functional packaging film and expand application of nanocellulose-starch packaging film. CSNC-CSS film was prepared by corn straw nanocellulocellulose (CSNC) and corn straw starch (CSS), and the effects of different ultrasonic-microwave co-treatment systems on the properties of CSNC-CSS film were investigated. Compared with CSNC-CSS film prepared by other methods, CSNC-CSS film prepared by ultrasonic-microwave synergic system had better properties. The tensile strength of the film increased from 14.92 MPa to 26.46 MPa, with a growth of 77.35%. The elongation at break increased from 64.75% to 90.08%, with a growth of 39.12%. After ultrasound-microwave treatment, the moisture permeability and oxygen permeability decreased by 25.57 and 41.45% respectively. The light transmittance and dissolution time increased. CSNC-CSS film after ultrasonic-microwave synergistic treatment has better mechanical properties, moisture resistance and gas resistance, and has broad market application prospect.