Abstract:Polysaccharides were extracted from orange peel by ultrasonic method.Single factor test was used to investigate the effects of complex enzyme dosage，compound enzyme mass ratio，enzymatic hydrolysis temperature，enzymatic hydrolysis time，material liquid ratio，ultrasonic temperature and ultrasonic time on polysaccharide yield. On this basis，response surface method was used to further optimize the extraction technology. The experimental results revealed that optimum technological conditions for extraction of polysaccharide from orange peel were as follows：enzymatic hydrolysis temperature 52 ℃，enzymatic hydrolysis time 64 min，material liquid ratio 1 ∶32 （g/mL），ultrasonic time 21 min，and the yield of orange peel polysaccharide under these conditions was 33.02%.