The properties and modifying ways of collagen used for biomedical material were reviewed. At present, the modifying methods mainly include physical crosslinking, chemical crosslinking, and alloying with other polymers. These methods can endue collagen with some new functions, while keeping its activeness, but they have respective advantages and shortcomings, Recently composites of natural polymeric materials are becoming the hotspot in biomaterial fields. They exhibit special functions that cannot be obtain...