Magnesium　silicon　potassium　phosphate　cement　(MSPPC)is　an　innovative　high-performance　magnesium　phosphate　cement,which　is　different　from　ordinary　magnesium　potassium　phosphate　cement　(MKPC)using　acidic　potassium　dihydrogen　phosphate.　Its　necessary　raw　materials　include　basic　dipotassium　hydrogen　phosphate,magnesium　oxide　and　silica　fume.　MKPC　is　difficult　to　prepare　without　retarder,while　MSPPC　can　be　prepared　without　retarder　due　to　its　long　setting　time.　After　hardening,MSPPC　has　better　mechanical　properties　than　MKPC,but　its　working　performance　has　not　been　able　to　meet　the　needs　of　practical　engineering　applications.　The　setting　time　and　fluidity　can　be　adjusted　by　the　amount　of　retarder.　Borax　is　a　commonly　used　retarder　for　magnesium　phosphate　cement,but　its　potential　toxicity　problems　forces　the　need　to　find　a　safe　and　effective　alternative.　This　study　investigated　the　influence　of　sodium　gluconate　(SG)content　on　the　performance,compressive　strength,hydration　temperature,pH　value,phase　composition,porosity,and　microstructure　of　MSPPC,and　established　a　model　for　the　retarding　mechanism.　The　results　demonstrated　that　a　higher　SG　content　led　to　a　more　pronounced　retarding　effect.　At　the　SG　dosage　was　6%,the　initial　setting　time　was　extended　from　12　min　to　30　min,and　the　cement　paste　fluidity　improved　from　84　mm　to　142　mm.　The　proportion　of　pores　larger　than　0.1　μm　was　reduced,effectively　improving　pore　size　distribution.　Although　the　type　of　hydration　products　did　not　change,there　was　an　adverse　effect　on　the　3　d　compressive　strength,from　64.3　MPa　to　53.9　MPa,a　decreased　by　16.2%,while　the　56　d　compressive　strength　decreased　by　6.99%　and　the　adverse　effect　was　reduced.　©　2024　Cailiao　Daobaoshe/　Materials　Review.　All　rights　reserved.