PKC is a promising mannan rich bioresource that can be exploited for extraction of fermentable sugars.Enzymatic hydrolysis of mannan content of PKC by mannanse was enhanced underoptimum conditions of hydrolysis in which PKC concentration, mannanase loading, hydrolysis pH value, temperature and hydrolysis time of 20%(w/v),5%(w/w),4.5,45午Cand 72h,respectively were utilized.Total fermentable sugar of 71.54±2.54g/L was produced in optimum conditions. ABE fermentation of monomeric sugars by C.saccharoperbutylacetonicum N1-4 led to 3.27±1.003g/L biobutanol with 0.071±0.004g/g biobutanol yield and 0.026±0.004g/L/h biobutanol productivity.