To　study　the　influence　of　unsaturated　carboxylate　on　the　dispersing　and　flow　releasing　ability　of　slow-release　polycarboxylate　superplasticizer(PCE),the　hydrolysis　behaviors　of　carboxylates　in　sodium　hydroxide　solution　at　pH　value　of　12.0　was　investigated,　and　the　constants　of　hydrolysis　rate　were　derived　via　a　linear　fitting.　Mini　slump　was　used　to　examine　the　variation　of　flow　of　cement　pastes　containing　the　synthesized　slow　releasing　PCE　over　time,　and　the　results　were　compared　and　analyzed　to　coordinate　the　relationship　of　hydrolysis　behaviors　of　carboxylates　and　slow-release　effectiveness　of　PCE.　The　results　indicate　that　PCE　with　the　substitution　of　acrylic　acid　with　33.3%　methyl　acrylate　and　25.0%　dimethyl　itaconite　showed　significant　slow-release　effect,　the　initial　fluidity　of　cement　paste　was　149　mm　and　104　mm　afterwards　increased　to　223　mm　and　212　mm　after　2　h　respectively.　PCE　with　carboxylate　monomer　of　faster　hydrolysis　rate　exhibited　quicker　flow　releasing　property,　and　PCE　with　carboxylate　monomer　containing　more　ester　grouped　manifested　stronger　flow　releasing　ability,　but　need　longer　time.　The　flow　releasing　property　of　PCE　not　only　depended　on　the　hydrolysis　rate　and　ester　group　amount　of　monomer,　but　also　related　to　its　reactivity　of　monomer　to　match　the　copolymerization　system.　©　2020,　Editorial　Department　of　Journal　of　the　Chinese　Ceramic　Society.　All　right　reserved.