Recycled　aggregate　concrete,　as　a　new　environmental　protection　material,　meets　the　strategy　of　saving　resources　and　energy,　reducing　environmental　pollution　and　sustainable　development.　It　is　the　main　research　and　promotion　direction　of　green　concrete.　The　surface　of　recycled　aggregate　is　adhered　to　old　cement　mortar,　rough　and　angular,　and　contains　a　large　number　of　holes　and　microcracks　during　secondary　crushing.　Compared　with　natural　aggregate,　recycled　aggregate　has　some　shortcomings,　such　as　low　density,　high　water　absorption,　large　crushing　index,　poor　firmness　and　large　dispersion,　and　there　is　a　weak　interface　between　recycled　aggregate　and　adhered　mortar,　which　affect　the　performance　of　recycled　aggregate　concrete　and　restrict　its　application　in　practical　engineering.　So　improving　the　performance　of　recycled　aggregate　is　one　of　the　key　problems　in　the　research　of　recycled　aggregate　concrete.　The　existing　methods　to　improve　the　performance　of　recycled　aggregate　concrete　mainly　focus　on　the　mixing　method,　adding　mineral　admixtures　and　optimizing　the　mix　of　concrete　in　the　mixing　stage,　or　by　optimizing　the　gradation　of　recycled　aggregate　and　reducing　the　replacement　rate　of　recycled　aggregate　to　reduce　the　adverse　effect　of　recycled　aggregate.　However,　the　defect　of　recycled　aggregate　has　not　been　substantially　improved.　The　performance　of　recycled　aggregate　can　be　improved　by　enhancement　treatments.　The　enhancement　treatments　mainly　start　with　the　mortar　attached,　and　remove　or　enhance　the　old　mortar　by　physical,　chemical　or　biological　methods,　so　as　to　enhance　the　performance　of　recycled　aggregate,　such　as　mechanical　grinding,　pre-soaking　in　pozzolanic　solution,　nanomate-rial　slurry,　carbonation,　et　al.　In　addition,　the　component　recombination　method　can　also　improve　the　performance　of　recycled　aggregates,　and　thus　improve　the　performance　of　recycled　aggregate　concrete.　In　this　paper,　the　research　progress　and　their　mechanism　of　each　recycled　aggregate　enhancing　methods　at　home　and　abroad　were　summarized,　the　strengthening　effect　of　enhancement　methods　were　analyzed,　and　the　direction　of　further　research　on　enhancing　of　recycled　aggregate　was　put　forward.　©　2021,　Materials　Review　Magazine.　All　right　reserved.