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The mapping relations between different models are the foundation and basis for the transformation in model-driven software development. Based on ontology semantic mappings, a classification for different level model mappings is proposed and discussed by abstractly analyzing the characteristics of syntax and semantic features of modeling languages. On this basis, a further study was conducted to reason about the definition process for mapping relations. The work can be used to build mapping relations from source models to target models, and thus make an effective support to model driven development.