AIN/BN　laminated　ceramic　composites　were　fabricated　by　a　flow　casting　method.　The　thermal　shock　behavior　of　both　block　AlN　ceramics　and　AIN/BN　laminated　ceramic　composites　were　carried　out　for　comparison.　To　understanding　the　different　of　thermal　shock　resistance　for　the　two　materials,　the　microstructures　were　observed　and　the　mechanical　properties　were　tested.　The　results　showed　that,　the　thermal　shock　resistance　of　AIN/BN　laminated　ceramic　composites　was　larger　than　that　of　block　AlN　ceramics.　During　the　tests　of　residual　strength　after　quenching　from　different　temperatures,　for　the　block　AIN　ceramics,　the　residual　strength　would　decrease　rapidly　when　the　critical　temperature　difference　ΔTc　was　larger　than　450　°C,　on　the　other　hand,　for　the　AIN/BN　laminated　ceramic　composites,　the　residual　strength　would　decrease　slowly　and　there　was　no　obvious　ΔTc.