Beta　zeolites　were　successfully　synthesized　via　hydrothermal　method　using　sodium　aluminate　as　aluminium　source,　silica　sol　(Ludox)　as　silicon　source　and　TEAOH　as　template,　respectively.　The　effects　of　different　additives　polyvinyl　pyrrolidone　(PVP)　and　Methyltriethoxysilane　(MTS)　on　their　structural　properties　and　synthesis　mechanism　were　investigated　in　detail　by　various　characterizations,　such　as　XRD,　TEM,　BET,　ICP,　29Si-NMR　and　NH3-TPD　method.　Also,　their　catalytic　performances　were　evaluated　through　catalytic　cracking　of　cumene.　The　results　showed　that　the　beta　zeolite　obtained　in　the　PVP-added　system　presented　a　better　crystallinity,　higher　Si/Al　molar　ratio　(25.68),　and　larger　surface　area　(772　m2/g).　Comparably,　the　MTS-effected　samples　revealed　a　larger　surface　area　(657　m2/g),　higher　Si/Al　molar　ratio　(25.76),　but　lower　crystallinity　and　smaller　particle　sizes(around　160-320　nm).　Moreover,　both　of　them　exhibited　a　good　catalytic　activity　for　cumene　cracking　due　to　the　existences　of　abundant　and　strong　acid　content.　©　2017,　Science　Press.　All　right　reserved.