A　NoC　is　a　critical　shared　resource　among　these　concurrentlyexecuting　applications,　significantly　affecting　system　performance,　and　energy　efficiency.　In　this　paper,　we　propose　B2L,　a　buffered　and　bufferless　hybrid　NoC　design　that　can　satisfy　application＇s　performance　requirements,　while　the　system＇s　energy　consumption　is　minimized.　This　can　be　achieved　by　designing　a　dedicated　buffered　and　bufferless　NoC　separately,　and　dynamically　control　flits　from　different　apps　or　within　the　same　app　to　flow　across　the　two　networks　according　to　application＇s　requirement　and　network　status.