Benzyl cellulose (CBz) with a degree of substitution (DS) of ca.2 was synthesized from cellulose and benzyl chloride (BzCl), and three sorts of macroinitiators of chloroacetyl benzyl cellulose (CBz-CACl). Chloromethylbenzoyl benzyl cellulose (CBz-CMBCI), and dichloroacetyl benzyl cellulose (CBz-DCACI) used for ATRP were synthesized by using the CBz and the acid chlorides of chloroacetyl chloride (CACl), p-chloromethylbenzoyl chloride (CMBCl) and dichloroacetyl chloride (DCACl), respectively. The graft copolymerizations of methyl methacrylate (MMA) and styrene (St) via ATRP by using these macroinitiators were carried out. In the system of graft copolymers of poly ((CBz-CACl)-g-MMA), theliving character of the polymerization was confirmed by the relationship of the added monomer amounts to the molecular weights of the graft chains. The changes of the X-ray diffraction patterns and the surface morphologies caused by the modification of cellulose were seen from the XRD measurements of the graft copolymers and the SEM micrographs observations of the poly ((CBz-CACl)-g-MMA)s, respectively.