本文利用超声波辅助提取杨桃叶多糖，先考察了不同浸提次数、料液比、温度、功率和时间对杨桃叶多糖提取含量的影响，然后再根据单因素试验结果，以料液比、温度、功率、时间为考察因素，选用L9(34)正交表进行正交试验，优化杨桃叶多糖的提取工艺，并对结果进行分析。结果显示：杨桃叶多糖最佳提取工艺参数为：料液比为1:50、温度为65 ℃、功率为450 W、时间为35 min，以此条件提取的多糖含量为18.89 mg/g。

In this research, polysaccharides were extracted from carambola leaves by adopting the ultrasonic-assisted extraction technique. The influence of extraction times, solid-liquid ratio, temperature, ultrasonic power and radiation time on the extraction yield of carambola leaves polysaccharides was investigated. By using the orthogonal array L9(34), the optimum extraction conditions of carambola leaves polysaccharides were determined as: solid-liquid ratio 1:50, temperature 65 ℃, ultrasonic power 450 W and radiation time 35 min, under which the extraction yield of carambola leaves polysaccharides reached 18.89 mg/g.