The C30 recycled coarse aggregate concrete is produced by use of the concrete blocks from the dismantled masonry structure buildings and the influence of recycled coarse aggregate replacement percentages,water cement ratio,and sand ratio on the 28 d compressive strength and workability are studied in orthogonal experiment design.The results show that the recycled coarse aggregate replacement percentages is the most primary factor effecting on 28 d compressive strength and workability;and with the recycled coarse aggregate replacement percentages increased,strength and workability decreased;It calls for using the percentages of 60% as recycled coarse aggregate,0.5 as water cement ratio and 36% as sand ratio to make reasonable design of mix proportions,we can obtain the recycled coarse aggregate concrete that its 28d compressive strength reach to 46.3 MPa.