电子态密度是指单位能量范围内的状态数，是与电子能带结构密切相关的一个物理量.为了计算电子的比热和晶体的输运性质，必须用较精确的方法计算出晶体的电子态密度.大多数教材中对该部分的处理通常采用简化模型，并不能反映一般情况下态密度的计算思路.本文从电子态密度的公式出发，详细说明了二维石墨烯和三维面心立方晶格态密度的计算步骤，并且对其中细节给出了基于数值计算的详细解释.

The electronic density of states is the number of states in the unit energy range.It is a physical quantity closely related to electronic energy band structure.In order to calculate the specific heat of electrons and the transport properties of crystals,a more accurate method must be used to calculate the electronic density of states.The processing of this in general textbooks usually adopts simplified models,which does not reflect the calculation ideas of states density in general.In this article,two-dimensional graphene and three-dimensional face-centered cubic lattice are explained in detail based on the formula of electronic density of states.The calculation steps of the density and a detailed explanation based on numerical calculation are given.