Model evolution involves a series of complex change activities and should follow certain constraints to preserve certain properties of models. An illustration of model evolution was showed. Based on the set-valued mapping, the mapping from model elements to semantics domain was defined. Syntax and semantics properties of model evolution such as property preserving,consistency,absorbing and equivalence were studied by defining the semantic function.%模型演化由一系列复杂的变化活动组成,要遵循一定的约束以保持模型的某些特性.以一个实例描述模型演化的过程,并以集值映射为基础,定义模型成分与语义域的映射,通过定义模型演化的语义函数,研究模型演化的语法和语义性质,包括特性保持、一致性、等价性和吸收性等.
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