In　this　work,　the　effects　of　sucrose　on　setting　time,　heat　of　hydration　and　hydration　products　were　studied,　and　the　corresponding　hydration　process　and　regulation　mechanism　were　discussed.　With　the　adsorption　test　of　sucrose　on　Ca(OH)2　suspensions,　the　＇wake　up＇　mechanism　of　Ca(OH)2　on　sucrose-retarded　cement　was　discussed.　The　results　indicate　that　sucrose　is　used　as　retarder　to　increase　the　dormant　period　by　adsorption　to　the　cement　surface,　but　there　exists　a　critical　amount　of　sucrose.　And　the　XRD　patterns　indicate　that　sucrose　can　accelerate　the　reaction　of　C3A　and　the　formation　of　AFt,　but　restraint　the　hydration　of　C3S.　Ca(OH)2　that　was　used　as　accelerator　in　this　paper　can　adsorb　the　sucrose　up　to　6.2mg　sucrose/g　Ca(OH)2.　The　combined-use　of　sucrose　and　Ca(OH)2　does　not　change　the　shape　of　the　heat　rate　curves　significantly.　And　the　dormant　period　of　sucrose-retarded　cement　can　be　decreased　with　the　doses　of　Ca(OH)2　increasing,　because　of　its　high　surface　and　preferential　adsorption　of　sucrose.　©　2017　Trans　Tech　Publications,　Switzerland.