Polyether　macromonomers,　used　for　synthesizing　polycarboxylate　superplastizers　(PCE),　have　been　continuously　innovated　and　developed　into　a　series　of　products　possessing　different　structures　and　molecular　weights　with　the　continuous　application　expansion　of　PCE.　In　this　paper,　the　development　process　of　polyether　macromonomers　was　briefly　reviewed,　then　in　order　to　understand　the　copolymerization　reactivity　of　commonly　used　polyether　macromonomers　(APEG,　MAPEG,　IPEG　and　EVPEG),　the　structural　characteristics　and　the　electron　effect　of　polyether　macromonomers　were　analyzed.　The　copolymerization　activity　of　polyether　macromonomers　was　further　confirmed　by　monitoring　conversion　rate　and　composition　in　copolymers　in　the　copolymerization　process.　The　results　show　that　the　electron　cloud　distribution　of　polymerizable　double　bond　in　polyether　macromonomers　is　evidently　affected　by　their　different　end　groups.　In　free　radical　copolymerization,　the　free　radical　activity　of　polyether　macromonomer,　instead　of　its　reactivity　ratio,　determines　the　chain　growth　rate　and　monomer　copolymerization　activity.　In　addition,　EVPEG-3000　manifested　the　highest　conversion　rate　and　the　highest　content　in　the　copolymer,　compared　with　APEG-1200,　MAPEG-2400　and　IPEG-2400　when　copolymerized　with　acrylic　acid　(AA)　via　aqueous　free　radical　copolymerization　(acid/ether　ratio　was　3.75).　From　high　to　low,　the　copolymerization　activity　of　polyether　macromonomers　is　in　the　order　of　EVPEG　(VPEG),　IPEG,　MAPEG　and　APEG.　©　2022　American　Concrete　Institute.　All　rights　reserved.