C25 grade waste concrete was prepared to produce beam bond test specimens with different recy- cled coarse aggregate contents. The effects of recycled coarse aggregate contents to total porosity and bond behavior between recycled coarse aggregate concrete and steel bar were studied by total porosity tests and bonding tests. The results show that the total porosity of recycled aggregate concrete increases场1.1% and 1. 6%respectively when recycled coarse aggregate contents increases to 30% and 50% from 10%， and the bond behavior decreases with the increase of recycled coarse aggregate contents.