With　wet　surface　modification　of　kaolinite,　composite　of　PP/Kaolinite/PP-g-MAH　was　prepared　by　melt　blending　process.　The　kaolinite　and　composite　were　characterized　by　means　of　Flourier　transform　infrared　(FTIR)　spectroscopy,　thermo　gravimetric　analyzer　(TGA),　X-ray　diffraction　(XRD)　and　scanning　electron　microscope　(SEM),　and　mechanical,　thermal　performance　test.　The　results　indicated　that　the　modifier　reacted　well　with　kaolinite　and　produced　synergistic　effect　well　with　PP-g-MAH.　The　tensile　strength　increased　by　10.6%,　notched　impact　strength　was　better　than　unmodified　kaolinite　composite.　XRD　showed　that　the　diffraction　peaks　of　the　composite　didn＇t　change　evidently,　and　kaolinite　had　heterogeneous　nucleation　effect　and　increased　the　degree　of　crystallization　greatly.　The　heat　distortion　temperature　of　the　composite　was　increased　by　18°C.　SEM　analysis　showed　that　the　modified　kaolinite　particles　were　homogeneously　dispersed　in　the　PP　matrix,　and　the　modification　effect　of　kaolin　was　increased.