A graphite-like layered material of composition BCxNy (x=2.0-2.4, y=0.8-0.9), which is called BC2N in this paper, was prepared by a chemical vapor deposition method at 1770-2220 K. Lithium (Li) and potassium (K) were intercalated into BC2N by an electrochemical method and a vapor-phase reaction, respectively, to make the first-stage compounds with interlayer spacings similar to those of the first-stage graphite intercalation compounds. Sodium (Na) was intercalated into BC2N by the electrochemical method as well as the vapor-phase reaction, whereas Na was hardly intercalated into graphite. The X-ray diffraction analysis and an electrochemical capacity suggested that the Na-intercalated BC2N was a mixture of the first- and second-stage compounds. X-ray absorption spectroscopy indicated that an unoccupied pi(*) orbital of BC2N showed a relatively strong intensity, and the bottom of the orbital was at an energy lower than each bottom of graphite, noncrystalline carbon, and BC6N. These results suggested that alkali metals including Na could donate electrons to BC2N more efficiently than the other host materials. Thus, the intercalation of alkali metal into BC2N proceeds more effectively than the other host materials.