Current　research　on　recycled　concrete　structures　mainly　focuses　on　recycled　concrete　in　lower　strength　,　reduced　scale　,　and　relatively　simple　loading　conditions.　The　design　theory　methods　based　on　these　studies　have　many　limitations　need　to　be　improved　significantly.　This　paper　summarizes　the　studies　on　recycled　concrete　structures　at　homeandabroad　includingmechanicalpropertie　ofrecycledconcrete　tructure　ei　micperformanceofrecycled　concrete　beams　,　columns　,　joints　,　shear　walls　,　frame　structures　,　and　frame-shear　wall　structures.　Previous　studies　are　briefly　reviewed　,　and　some　notable　projects　are　presented.　Based　on　the　state-of-the-art　review　,　this　paper　proposes　some　critical　technical　issues　for　future　research　and　offers　some　suggestions.　Previous　studies　indicated　that　the　developmen　to　frecycledconcretestructuresisamaindem　and　for　building　material　srecycling　and　building　wasterecycling.　Also　recycledconcrete　structures　can　be　used　for　seismic　design　of　building　structures.