This study confirmed different results according to the molecular weight and pore properties of treated pulp. In this study the pre-treated enzyme material was increasing the beating speed compared with non-treated one. And it was observed that the change of freeness according to the combination ratio depended upon the pores size of pulp and that fibers became flexible owing to the physical deformation of fibers themselves through pre-treated enzyme increasing the flexibility of fibers to increase the contact area of fiber and thus resulting in the increase of specific surface area, the increase of fiber bonding strength and the increase of beating speed.