Electron diffraction and high-resolution electron microscopy have been used to investigate the structures of the tubular conical-helix of graphitic boron nitride. An ordered interlayer structure showing a certain coincidence site lattice has been documented by electron diffraction. Meanwhile, the graphite-type ABAB packing was observed in this BN nanostructure, indicative of an actual wrapping performance around a 120degrees symmetry position and the dominant role of the density rather than the type of interlayer interaction in the interlayer configuration. Finally, structural elements defining the complete structure of a conical-helix have been summarized and discussed.