The effect of gangue content on concrete strength and elastic modulus was studied in this paper and the mathematical model of modulus calculation was built up for gangue concrete.In the tests, concrete specimens in four strength grades of C20-C50 were prepared using equivalent replacement with substitution of 20%-100% gangue for gravel, and adjusted the concrete workability by admixture adding.The specimens were tested according to Standard GB/T50081, then the effect of gangue content on concrete strength and elastic modulus were studied.The mathematical model of strength, elastic modulus and apparent density of gangue concrete were built up.