Monomer　casting　polyamide　6(MCPA6)/toluene　2,4-diisocyanate　functionalized　multi-walled　carbon　nanotubes　(MWNTs-NCO)　nanocomposites　were　prepared　via　in　situ　anionic　ring　opening　polymerization,　and　the　non-isothermal　crystallization　behavior　of　the　nanocomposites　were　investigated　by　differential　scanning　calorimetry　with　various　cooling　rates.　The　commonly　used　Avrami,　Ozawa,　Mo,　and　Urbanovici-Segal　models　were　employed　to　analyze　the　non-isothermal　crystallization　data　and　the　validity　of　the　models　on　the　process　of　MCPA6　and　its　nanocomposites　was　discussed,　where　Mo　and　Urbanovici-Segal　models　could　well　describe　the　non-isothermal　crystallization　process　for　the　samples.　The　results　revealed　that　MWNTs　could　accelerate　the　crystallization　process　of　MCPA6,　attributing　to　the　nucleating　effect　of　the　nanofillers.　Finally,　the　effective　energy　barrier　for　non-isothermal　crystallization　was　evaluated　as　a　function　of　the　relative　crystallinity　by　applying　an　isoconversional　method.