Abstract: The objective of this research was to evaluate the effect of potato pulp under cellulose- hydrolysis and the composite process of α- amylase and cellulase on functional properties. The soluble dietary fiber( SDF) content increased significantly under enzyme treatment. The soluble dietary fiber content reached 14.38g·100g- 1with cellulose- hydrolysis,18.74% higher than that control.The soluble dietary fiber content reaches 15.00g·100g- 1with the treatment of the composite process,which was 4.31% higher than that of potato pulp with single enzymatic hydrolysis,and 23.86% higher than that control of potato pulp without treating. Scanning electron microscope showed that enzymatic hydrolysis made the structure looser. Therefore,different functional properties were improved.Higher values of ion exchange capacity,oil and water retention rate and inflation properties were found to be enhanced in potato pulp after treatment by enzyme.The group treated by double enzyme hydrolysis showed the best properties and was also superior to common products in the market.In addition,the residual starch of potato pulp could become easier to digest after enzymatic treatment.