A　novel　superplasticizer　with　a　multi-arm　structure,　i.e.,　a　＇core＇　connected　with　multiple　copolymer　＇arms＇,　was　synthesized　through　two　steps　including　an　esterification　reaction　between　polyhydric　alcohols　and　acrylic　acid　and　a　copolymerization　reaction　in　an　aqueous　solution　among　the　esterification　product,　isobutenyl　polyethylene　glycol　and　acrylic　acid.　The　reaction　conditions　were　determined,　and　the　results　showed　that　the　esterification　rate　can　reach　above　95%　with　a　water-carrying　agent　of　70g,　a　catalyst/alcohol　molar　ratio　of　0.07,　an　inhibitor/monomer　molar　ratio　of　0.03,　and　a　reaction　time　of　7　hrs.　The　reaction　products　were　characterized　by1H　Nuclear　Magnetic　Resonance　(1H　NMR)　and　Fourier　Transform　infrared　spectroscopy　(FTIR).　It　is　confirmed　to　be　the　multi-arm　structure,　and　the　self-synthesized　superplasticizer　with　a　multi-arm　structure　exhibited　higher　energy　efficiency,　which　was　in　accordance　with　its　excellent　paste　fluidity　performances　and　adsorption　behavior　in　cement　paste.　©　(2015)　Trans　Tech　Publications,　Switzerland.