an rgd polypeptide grafted poly / β - tricalcium phosphate composite material is composed of β - tricalcium phosphate particles and rgd polypeptide grafted poly with mass ratio of 1 : 10 - 1 : 100 , in which the β - tricalcium phosphate particles are uniformly dispersed in the rgd polypeptide grafted poly matrix . the preparation method includes that poly is polymerized with grgdy short peptide to obtain rgd polypeptide grafted poly , and then rgd polypeptide grafted poly is compounded with β - tricalcium phosphate particles . the composite material exhibits favorable biocompatibility , cellular affinity , biodegradability and mechanical behavior , and can avoid aseptic necrosis of tissues , which may be used as nerve guide or porous bone scaffold for repairing nerve tissue and bone tissue .