Cement-based　materials　are　brittle　and　low　in　flexural　strength,　which　can　be　greatly　improved　by　adding　organic　monomers　to　cement-based　matrixes　due　to　the　polymerization　effect　of　added　the　organics.　The　solution　polymerization　behaviors　of　organic　monomer　in　cement　paste　and　its　effect　on　cement　properties　have　been　studied　in　this　paper.　The　results　show　that　the　organic　monomers　used　in　the　experiment　can　well　polymerize　themselves　in　cement　pastes　by　solution　polymerization　effect　under　common　conditions.　As　results,　the　cement　composites　have　a　flexural　strength　between　17.8　and　33.4　MPa,　greatly　dependent　on　the　amount　of　organic　monomers　added　and　is　stable　when　it　is　immersed　in　water,　acid,　alkali　and　salt　solutions.　Besides,　the　setting　time　of　the　composites　can　be　controlled　and　regulated.　(C)　2003　Elsevier　Ltd.　All　rights　reserved.