Three gelatins with α component content 20．5％

41％and 50％

respectively

were used as raw materials for the preparation of gelatin／hydroxyapatite composites by simultaneous titration method

and then the tensile properties for dryfilms of the three composites

includingtensile strength

Young’ modulus and elongation at break

were measured and compared．The results showed that all of the three tensile parameters increased with increasing the α component content of gelatins．Among them

the Young’s modulus of composites was more sensitive to the α component content of gelatins．The mechanical properties of composite C with the hishest α component content were shown as follows：86．40 MPa of tensile strength．2682．35 MPa of Young’s modulus and 8．65％of elongation at break．In addition

the characterization results of basic properties of composite C revealed that this material had the composition and structure similar to those of natural bones

and therefore was promising to be a good candidate for bone substitute materials.