At present, the application of historical and abundant Mongolian idioms is dwindling, and its carried national culture is disappearing gradually, which poses great challenges. In response to this distress situation, the previous project has collected and organized large-scale idioms resources, developed a knowledge base that includes 35,000 idioms and its related web platform to provide a convenient tool for language education and the natural language processing of Mongolian. On the basis of the developing experience and resource data of the “Knowledge Base of Mongolian Idioms”, the paper will dissertate the paradigmatic relation of Mongolian Idioms briefly, including variant, polysemy, synonymy and antonymy, and illustrate its related semantic and pragmatic features, attempt to provide a reference for the deeper theoretical exploration and applied construction in the future.