Recycled concrete is a cutting-edge technology of solid waste reuse,which can effectively improve the utilization rate of solid waste resources and alleviate the environmental pressure caused by construction waste.In order to study the influencing factors of recycled coarse aggregate porous concrete strength,some fly ash materials are added to the cement.Through the indoor uniaxial compressive strength test,the variation law of recycled concrete strength under different recycled coarse aggregate content,different water binder ratio and different bone binder ratio are discussed.The results show that with the increase of coarse aggregate,the compressive strength of concrete increases significantly,but when it reaches a certain content,the performance of concrete will decrease significantly.In addition,the increase of bone cement ratio and water cement ratio will reduce the compressive strength of recycled coarse aggregate porous concrete.The research results can provide reference for relevant concrete engineering.