本文采用紧束缚电子模型计算六角密积晶格的能带．结果表明，六角密积晶格的能带为特殊的复数形式，产生复能带的原因是由于其独特的晶格结构导致近邻原子的对称性破缺造成的．在倒空间kz=0的平面上，实部关于kx轴和ky轴对称，而虚部则只关于ky轴对称，关于kx轴不对称，这是由直角坐标空间六角密积晶格中次近邻的两个密排层原子的不对称性决定的．本文相关研究结果既是固体物理教学内容的拓展，同时也可为分析晶体材料相关物理性质提供理论依据．

 The tight bound electron model is used to calculate the energy band of hexagonal close-packed lattice. The results show that the energy band of hexagonal close packed lattice is of a special complex form, and the reason for the formation of the complex energy band is that its unique lattice structure leads to the symmetry breaking of neighboring atoms. On the plane of reciprocal space kz=0, the real part is symmetric about the kx axis and the ky axis, while the imaginary part is only symmetric about the ky axis and asymmetric about the kx axis, which is determined by the asymmetry of the next nearest neighbor atoms of the hexagonal close-packed lattice in the rectangular coordinate space. The relevant research results are not only the expansion of the teaching content of solid physics, but also provide a theoretical basis for analyzing the relevant physical properties of crystal materials.