Based　on　the　reactivity　ratio　of　comonomers　of　polycarboxylic　acid　superplasticizer　(PCE)　obtained　by　experiment,　the　supplemental　time　and　amount　of　acrylic　acid　(AA)　were　determined　by　controlling　the　conversion　rate　and　active　monomer　addition　through　theoretical　calculation　and　experimental　test　results,　so　that　the　monomer　composition　of　AA　and　macromonomer　methyl　allyl　polyethylene　glycol　(MAPEG)　remained　unchanged　in　the　copolymerization　system　to　ensure　the　consistency　of　the　copolymer　composition　synthesized　at　different　time　point.　The　composition　difference　of　the　copolymers　obtained　from　controlled　feeding　process　(CFP)　and　traditional　feeding　processes　(TFP)　was　compared　in　order　to　systematically　study　the　accuracy　and　reliability　of　CFP,　and　the　effect　of　copolymer　composition　on　its　dispersion　performance　was　investigated.　The　results　showed　that　in　the　process　of　PCE　preparation　by　CFP　based　on　reactivity　ratio,　AA　consumed　faster　in　stage,　which　addition　inhibited　the　variation　amplitude　of　AA　and　MAPEG　in　the　instantaneous　composition　of　copolymer,　and　the　average　acid/ether　ratio　[n(AA)/n(MAPEG)]　of　PCE　prepared　by　CFP　were　2.8,　3.8　and　4.8,　respectively,　which　were　basically　consistent　with　the　designed　values　(3.0,　4.0,　5.0).　The　PCE　prepared　by　CFP　showed　higher　average　main　chain　length,　carboxyl　content　and　macromonomer　content,　which　increased　the　coverage　area　and　adsorption　layer　thickness　of　PCE,　thus　improving　the　initial　fluidity　and　fluidity　retaining　ability　when　used　in　cement　paste.　©　2024　Fine　Chemicals.　All　rights　reserved.