Abstract: Taking cemented carbide as example, using scanning electron microscopy, electron backscatter diffraction(EBSD) and statistical grain boundary structure analysis methods, the structure of grain boundary of special even weight lattice was observed. Its main process is ①accurately separate the carbide/carbide boundaries; ②accurately classify the carbide/carbide boundaries according to different standards; ③study the orientation texture of boundary planes of typical CSL boundaries including Σ2 and Σ13 a via five parameter analysis (FPA) method, and ④further calculate the geometrically characteristic boundaries.The research results include the extraction and classification technology of specific boundaries, and include interface structure analysis technology of CSL boundaries. The research results also include the feedback of CSL boundary structure on the material properties, and the effective reference towards other hexagonal materials.