Abstract: Silane/Maleic Anhydride Grafted PE-HD (MAH/VTMS -g-PE-HD) were preparaed with using silane and maleic anhydride as monomer, dicumyl peroxide(DCP) as initiator. The effect of silang(VTMS) and maleic anhydride(MAH) and DCP content on the properties of MAH/VTMS-g-PE-HD were investigated. The grafting was analyzed by FTIR and applied in composites. The results demonstrated that VTMS and MAH were successfully grafted onto PE-HD and the grafted degree increased firstly then decreased with increase of DCP, VTMS and MAH concentration. Compared with MA-g-PE-HD and VTMS-g-PE-HD, MAH/VTMS-g-PE-HD more efficiently improved the properties of composites.