This study investigated the optimal extraction conditions of chestnut shells' polysaccharides by utilizing three different methods, ultrasonic extraction,water extraction, and alkali extraction. The single factor test and orthogonal experiment were adopted to optimize the extraction conditions. The results indicated that the best extracting method was ultrasonic extraction and the polysaccharides is 915%. The yields of polysaccharides from water extraction and alkali extraction were 599% and 472%. The yields of three methods were significantly different by analyzing with SPSS