Two-dimensional (2-D) boron nitride (BN) nanomaterialsand BN nanotubes 7 were continuously reported. Since the discovery of graphene 8 , two-dimensional (2D) nanomaterials have drawn extensive attention as potential building blocks for future nano scaled devices 9 . Follow-up as well as some other two-dimensional materials (like BN) were separated out in succession. Wang et al.10 find a simple and novel "biomass-directed on site synthesis" method to fabricate large scale high quality boron nitride nanosheets. The use of BN nanosheets in epoxy resin exhibit higher properties than pure epoxy resin in terms of thermal conductivity.The atomic structure of boron nitride and graphene is the same, but the boron nitride than graphene has better thermal stability and chemical inertness [10][11][12] . Therefore, two-dimensional boron nitride materials have more broad application prospects 13 in packaging field. Polyhydroxyalkanoates (PHA), as a novel plastic and packing material, has attracted the attention of academia and industry because of its unique physical characteristics such as complete bio-degradability, good biocompatibility, environmental protection, and plastic thermal processability 14,15 . However, PHA possesses a low thermal property and mechanical property, similar as conventional plastics. Studies launched on improving the thermal and mechanical properties of PHA. Xian et al. 16 find that the elongation to break, ultimate tensile strength and elastic module of PHA with 0.4% ZnO increase by 41.2%, 55% and 62.2%, respectively. But the thermal stability of ZnO reinforced PHA composites did not improve. BN materials, as frequently used fillers in polymers 17,18 , were also considered as candidates of filler in PHA. Xue et al. 19 find that with the addition of 2 wt% BN fibers, the