A　polycarboxylate　superplasticizer　(PCE)　with　a　novel　star-shaped　structure　was　prepared　through　copolymerization　of　acrylic　acid　(AA),　isobutenyl　polyethylene　glycol　(IPEG),　and　star-shaped　polymerizable　active　center　by　an　esterification　between　polyol　and　AA.　In　the　first　esterification　step,　the　esterification　rate　reached　more　than　95%　with　the　catalyst/polyol　ratio　of　0.07:1,　inhibitor/AA　ratio　of　0.04:1　(or　0.011:1),　water-carrying　agent　dosage　of　70g　and　esterification　time　of　7　hours.　In　the　second　polymerization　step,　the　highest　fluidity　of　cement　paste　was　achieved　at　the　initiator/AA/IPEG　ratio　of　0.28:　3.3:1.　Infrared　spectroscopy　(IR)　and　1H　Nuclear　magnetic　resonance　(1H　NMR)　measurements　were　used　for　structural　characterization,　and　the　spectral　results　confirmed　the　product＇s　star-shaped　structure.　Furthermore,　this　star-shaped　PCE　exhibited　higher　energy　efficiency　than　the　conventional　comb-shaped　PCE,　indicated　by　its　excellent　paste　fluidity　and　adsorption　behavior　in　cement　paste.