Ink sticks are one of the Chinese nation's treasures.However,as time goes by,most of them have mildewed,cracked,fractured,powdered and crumbled.It is difficult to preserve ink sticks for a long time,and protection and repair are urgently needed.The gelatin graft copolymer was synthesized by inverse emulsion polymerization with butyl acrylate (BA) and acrylonitrile (AN).Experimental parameters such as pretreatment time,monomer dosage,reacting temperature and times were investigated.The shear,the bending,and cleavage strengths,before and after accelerated aging,and resistance,were tested.The GEL/BA/AN graft copolymer was characterized by FTIR.In simulated repair tests,the shear,bending and cleavage strengths of samples adhered with gelatin-acrylonitrile butyl acrylate adhesive were found to be 0.44MPa,68 N/m and 69 N/m respectively; after accelerated aging,they were 0.37MPa,54 N/m and 44 N/m respectively.The results indicate that the restored ink-sticks have high bond strength.The method is also antibacterial,anti-fungal,anti aging and non destructive.It is an effective reinforcement and conservation method for ancient ink sticks.