||Hexagonal boron nitride(h-BN) is excellent thermal conductivity, thermal stability and mechanical properties. However “lip-lip” interaction between neighboring BN layers is stronger than the weak Van der Waals force between grapheme layers, and make the exfoliation of BNNS from h-BN more difficult than peeling off grapheme from graphite. Also, it is limited by the poor distribution of h-BN in polymers and no interfacial adhesion between h-BN and polymer matrix. It is hard to make high dispersed polymer nanocomposites. In this study, a novel facile mixture solvents strategy was developed for the preparation of h-BN nanosheets in large scale. Nanocomposites were prepared via in situ polymerization of ε-caprolactam in the presence of caprolactam functionalized hBN. The Obtained PA6/hBN product was used as a masterbatch for melt-blending with commercial PA6.