Introduction: This research was aimed to analyze mapping scheme of Traditional Iranian Medicine (TIM) with structure of common language of meta- thesaurus and Semantic network Unified Medical System Language (UMLS). The domain, location and relation of TIM in the UMLS is designed, and recitation of location and proportion of the TIM’s concepts are provided.

Methods: This is a triphasic research: A) System analysis, B) Documentary Analysis, and C) System designing method. In A phase, the structure of UMLS and TIM are studied and UMLS structure is searched for the ideal location of TIM. In B phase, literature and resources of TIM analyzed, then three examples: “Urine color” sign, “Epilepsy” disease, and “valerian” herbal drug, with whole of their branches, was extracted from among of total category of TIM science are prepared. Finally in C phase, the B phase examples are mapped with the UMLS concepts. In this case, conceptual and semantically relations analyzed and some new semantically relation are proposed.

Results: Output of this research is a prototype of TIM structure and its semantically relation with UMLS concepts in the Unified Medical Language System.

Conclusion: Although the current domain of UMLS has been covered suitable number of TIM’s concepts, but UMLS cannot reflex complete and formal structure from TIM’s knowledge. The hierarchical structure of TIM is designed the based on international models,and the location of TIM science in UMLS structure and conceptual relation between TIM concepts and UMLS concepts are proposed for the first time.