To evaluate the elasticity modulus of HVFA(High Volume Fly Ash) concrete, experiments were performed according to the ratio of fly ash usage and concrete compressive strength. Test results were shown that elasticity modulus of HVFAC was influenced by compressive strength, unit weight and fly ash usage ratio. And the existing codes of elasticity modulus had a large difference. So, new equation of elasticity modulus for HVFAC was proposed, and the proposed results had a good correlation with test results.