采用共混改性方法，将聚乳酸添加到聚羟基脂肪酸酯中，以提高材料的力学性能和成膜性能，制备了生物降解膜。通过对原材料进行黏度测试，确定共混加工工艺的加工温度为200℃，转速为20 r／min时，共混效果较好。对共混膜进行了力学性能测试和断面结构分析，得到当PHA与PLA质量比为100：50时，膜的拉伸强度为30 MPa，断裂伸长率为100%，共混膜的整体性能较佳。土埋降解实验显示共混膜具有一定的降解性能。

Biodegradable film was prepared through adding PLA to PHA using blending method to enhance mechanical property and the film formation ability of PHA. The preferable blending processing technological parameters were determined through viscosity measurement, which were the mixture temperature of 200℃ and the rotational speed of 20 r/min. The mechanical property of blended film was determined by the mechanical testing. The results showed that the film tensile strength can achieve 30 MPa and the breaking elongation rati0 100% when proportion of PHA to PLA is 100 : 50 (W/W). The composting degradation experiment confirmed that the blending film have degradable property.