AIN　particles　coated　with　nano-BN　were　synthesized.　The　AIN/BN　ceramic　composites　were　sintered　by　Plasma　Active　Sintering　(PAS).　Because　the　nano-BN　crystals　were　homogeneously　dispersed　around　the　AIN　grains　of　the　matrix,　the　chemical　corrosion　resistance　of　AIN/nano-sized　h-BN　ceramic　composites　was　higher　than　that　of　AIN/micro-sized　h-BN　ceramic　composites　and　monolithic　AIN　ceramics.　Due　to　the　better　hydrophobic　property　of　h-BN,　the　AIN/BN　composites　had　a　better　hydrophobic　property　than　the　monolithic　AIN　ceramic,　at　the　same　time,　because　of　the　homogeneous　dispersion　of　the　nano-BN,　the　creepage　discharze　voltage　of　AIN/nano-sized　BN　composites　was　the　highest.