The method to calculate principal axes of inertia by adjoint matrix of eigen matrix is given, examples are presented.

本文给出了用特征矩阵的伴随矩阵求惯量主轴的代数方法，并通过实例作了说明。

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On the base of loading properties of hollow cylinder apparatus, loading method to simulating the principal stress axes rotation in laboratory tests is given.

以此为基础，结合空心圆柱仪的加载特点，给出了室内模拟主应力轴旋转的加载方法。

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