Differential　scanning　calorimetry　was　used　to　investigate　the　effect　of　polymide6　(PA6)　grafted　Kevlar　fiber　on　the　non-isothermal　crystallization　behavior　of　PA6/Kevlar　fiber　composites.　The　results　showed　that　the　non-isothermal　crystallization　of　PA6　was　dominated　by　nucleation　while　the　un-grafted　Kevlar　fiber　played　an　role　of　heterogeneous　nucleation　agent　in　the　process　of　crystallization　of　PA6　and　increased　its　Tonsetc　and　ttotal.　The　PA6　grafted　Kevlar　fiber　still　played　the　role　of　heterogeneous　nucleation　agent　in　the　PA6/Kevlar　fiber　composites,　however,　its　effect　was　less　than　that　of　the　ungrafted　Kevlar　fiber.　This　may　be　ascribed　to　the　improved　interfacial　adhesion　between　PA6　and　Kevlar　fiber　in　the　composites　where　the　movement　of　PA6　segments　are　inhibitted.　The　melting　behavior　showed　that　the　join　of　Kevlar　fiber　made　the　temperature　and　intensity　of　low-temperature　melting　peak　improved.　Kevlar　fiber　also　improved　the　integration　degree　of　crystal.