Acid pretreatment and enzyme hydrolysis were applied for investigating the result of extracting sugar from cassava stalk.The results of pretreatment with hydrochloride acid and formic acid were compared.The influences of different conditions in pretreatment and enzyme hydrolysis on sugar yield were discussed.The results show that hydrochloride acid is better than formic acid in pretreatment.With the suitable conditions obtained in this study the yield of reducing sugar,relative to the o.d.raw material of ca...