Ca-montmorillonite　(Ca-MMT)　was　first　modified　with　different　amount　of　two　different　kinds　of　surfactants　to　obtain　organo-montmorillonites　(OMMTs)　directly　via　ion　exchange　between　Ca2+　and　alkyl　ammonium　cations.　Then　remained　Ca2+　in　OMMTs　was　reacted　with　pimelic　acid　(HA)　to　obtain　CaHA-OMMTs.　PP/CaHA-OMMT　composites　were　prepared.　Results　of　FT-IR　demonstrate　the　existence　of　long-chain　alkyl　in　OMMTs,　and　CaHA　in　CaHA-OMMTs.　The　reaction　between　HA　and　OMMT　could　lead　to　an　increase　in　d-spacing　value　of　clay.　CaHA-OMMTs　with　high　CaHA　contents　and　obviously　increased　d-spacing　values　were　obtained.　Results　of　WAXD　and　TEM　show　exfoliated　clay　platelets　in　PP/CaHA-OMMT　composites.　The　obviously　increased　Tc,　and　the　high　beta-phase　content　in　PP/CaHA-OMMT　composites　demonstrate　the　high　beta-nucleation　efficiency　of　CaHA-OMMTs.　Composites　with　higher　content　of　beta-phase　epitaxial　crystallized　on　exfoliated　clay　platelets　display　largely　improved　impact　strength.