Purpose To analyze the stress distribution of prosthesis with different materials after replacement. Method Three-dimensional finite-element analysis was used to analyze the stress distributon when the prosthesis were loaded in the static and walking state after the replacement of composite material prosthesis and CoCrMo alloy prosthesis respectively. Result When loaded CRF/PSF Group received 85%～98% of the stress while CoCrMo Group only received 50% the surface stress of the prosthesis was only 10% for the CRF/PSF Group and 50% for the latter. Conclusion Low elastic CRF/PSF composite prosthesis can significantly reduce stress shielding and concentration have high anti-fatigue strength and reach better mechanical compatibility.