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等参数任意六面体单元在有限元分析中有着重要的作用。本文目的在于建立该等参数单元的数学模型，并进行了形状函数偏导数的组合；此外，还具体讨论了应用这种等参数８节点单元求解胸腔三维恒定电场分布的方法。
Arbitrary parameters such as arbitrary hexahedral elements in finite element analysis plays an important role. The purpose of this paper is to establish the mathematic model of these parametric units and to combine the partial derivatives of the shape functions. In addition, the method of using this 8-node unit to solve the three-dimensional constant electric field distribution in the thorax is discussed in detail.