Nano　hydrated　calcium　silicate　/　polycarboxylate　copolymer　(C-S-H　/　PCE)　crystal　nucleus　suspension　is　a　new　type　of　early　strength　agent　for　cement　concrete.　It　can　shorten　the　cement　hydration　induction　period　and　promote　the　development　of　early　strength　of　cement　through　crystal　seed　nucleation.　This　article　investigated　the　effect　of　PCE　dosage　on　the　grain　size,　morphology,　and　PCE　actual　combined　dosage　of　nano　C-S-H　/　PCE　using　dynamic　light　scattering　(DLS),　electron　transmission　microscopy　(TEM),　organic　carbon　analyzer　(TOC),　and　thermogravimetric　analysis　(TGA)　during　the　synthesis　process.　The　effects　of　different　dosages　of　PCE　on　the　hydration　heat　release　rate,　flowability,　and　early　strength　of　cement　with　nano　C-S-H　/　PCE　seeds　were　also　investigated.　The　results　show　that　when　the　PCE　dosage　accounted　for　less　than　5.　0%　of　the　mass　fraction　of　nano　C-S-H　/　PCE　seeds　suspension,　the　average　particle　size　of　nano　C-S-H　/　PCE　seeds　gradually　decreases　with　the　increase　of　PCE　dosage,　and　the　agglomeration　situation　improves,　gradually　presenting　a　clear　tin　foil　like　morphology.　When　the　amount　of　PCE　increases　to　10.　0%,　there　is　little　change　in　the　particle　size　and　morphology　of　the　nano　C-S-H　/　PCE　seeds.　TOC　and　TGA　tests　show　that　when　the　PCE　dosage　is　5.　0%,　it　basically　reaches　saturation　adsorption　capacity　on　C-S-H.　Therefore,　excessive　PCE　will　reduce　the　promoting　effect　of　nano　C-S-H　/　PCE　seeds　on　the　hydration　heat　release　and　early　strength　of　cement.　©　2024　Bulletin　of　the　Chinese　Ceramic　Society　Press.　All　rights　reserved.