The unstructured mesh deformation in dynamic meshes is one of the key techniques in computational fluid dynamics and solid mechanics. This paper presents recent advances in the researches on unstructured mesh deformation, and makes a detailed classification of mesh deformation approaches. The existing mesh deformation methods are classified into pseudo-structural approach, partial differential equation and algebraic method. The advances and properties of main approaches of mesh deformation are summarized. The main research fields including mesh deformation, dynamic mesh generation with complex boundary under irregular deformations, dynamic mesh generation in 3D, parallel dynamic mesh generation and moving grids technique, are discussed in details. The trends of mesh deformation investigations are briefly presented as well.%动网格技术中的非结构网格变形是计算流体力学和计算固体力学的关键技术之一．本文在总结现有非结构网格变形方法的基础上，提出了一种网格变形方法的详细分类，将现有方法归类为虚拟结构法、偏微分方程法和代数法．本文综述了各类方法的最新研究进展，分析并比较了各类方法的特性，评述了当前网格变形研究的几个主要方向：复杂结构外形在不规则变形下的动网格生成、三维动网格生成、并行动网格生成和动节点技术．最后简要地探讨了该领域的发展趋势．
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