In　the　paper　the　authors　tried　to　use　chemical　disposal　to　bring　the　activity　mass　onto　the　surface　of　Kevlar　fiber　with　the　purpose　of　surface　graft　modification.　In　the　paper　the　authors　used　the　FTIR　spectra　to　discuss　the　graft　of　toluene-2,4-diisocyanate　onto　Kevlar　fiber.　The　authors　studied　and　analysed　the　effect　of　hydrolytic　time　on　the　content　of　-O-H　group　of　the　production,　and　the　effect　of　hydrolyzation　and　hexyl-lactam　steadily　disposing　on　the　graft　reaction.　The　result　showed　that　the　content　of　-O-H　group　increased　after　hydrolyzation,　it＇s　helpful　for　the　graft　reaction,　and　hexyl-lactam　steadily　disposing　made　the　graf　product　more　stable.　Through　the　research　the　authors　came　to　the　conclusion　that　by　bringing　some　activity　masses　onto　the　fiber　surface　the　authors　can　improve　the　interface　of　fiber/resin　effectively.