Abstract: In order to investigate the influence of hydrolyzed collagen (HC) and compatibilizer maleic anhydride grafted low density polyethylene (LDPE-g-MAH) on property of polymer materials, using low density polyethylene (LDPE) as the matrix, HC/LDPE and HC/LDPE-MAH composites were prepared by co-blend and extrusion method, then the samples of different specifications by injection molding were made. Through mechanical property test, SEM and thermal analysis, the effect of HC and LDPE-g-MAH content on morphology and properties of HC/LDPE, HC/LDPE-MAH were studied. Results show that when 5wt% of HC is added into the composites, the tensile strength of HC/LDPE composites reaches its maximum value 15.824 MPa. The addition of LDPE-g-MAH can improve the interface bonding, mechanical properties and thermal stability evidently, when 20wt% of HC and 4wt% of LDPE-g-MAH are added into the composites, HC/LDPE-MAH composites can obtain the optimal tensile performance.