Abstract:The extraction of polysaccharides from ginger was optimizition by Bom-Benhnken desing，a multiple quadratic regression describing the relationship between the parameters such as extraction time，extraction temperature，liquid-to-material ratio were established using a 3-factor，3-lever Box-Behnkon design，and the structure of polysaccharides was analysised by FTIR.The results showed，the optimal extraction condition was obtained as extraction time 2 h 44 min ，extraction temperature71.6 ℃，liquid-to-material ratio 41∶1（mL/g）.Under such conditon the yield of polysaccharides from ginger was 3.13%.From some experimengts，we find ginger polysaccharides have antioxidant activity.