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The disambiguation is a key problem of research on natural language. The concepts are the basic elements constituting natural language. First, a concept model adapted for representing the concept connotation, the extension, and the relation between the connotation and the extension is presented in this paper. Then a model of operational relation between the concepts is set up. Based on the two models, the abstract-concrete concept tree (ACCT) adapted for describing the relations between the abstract concepts and the concrete concepts is given. Finally, combining statistical analysis technique based on corpora, the description and the algorithm adapted for semantic combinatory disambiguation of natural language is given also.