【Objective】The extraction process of polysaccharides from Hibiseu smanihot L. was optimized,and its antioxidant activity was investigated,in order to provide basis for research and utilization of polysaccharides from H. smanihot L. 【Method】Taking extraction rate of H. smanihot L. polysaccharides as index, and on the basis of single factor experi-ment,the extraction technology assisted by ultrasonic was optimized by L9(33) orthogonal test. The antioxidant activities of H. smanihot L. polysaccharides were eva...