RESUMEN
Chinese medicine pair (CMP) was frequently applied in traditional Chinese medicine (TCM) clinic, and its significance was shown in long-term clinical practices and many accumulated experiences. It is the unique combination of two relatively fixed Chinese medicines in TCM clinic with the basic feature and principle of TCM compatibility, is the most fundamental and the simplest form of TCM formulae with certain theory basis and combinatory reason, which is proven effective. And the unique combination is frequently used for achieving mutual reinforcement or detoxication. CMP is an intermediate point between single herb and many TCM formulae, reflecting the regularity of TCM formulae compatibility and connotation of differential treatment. This paper analyzed and summarized the basic characteristics, development process and research significance of CMP, which aims to lead the modern basic and applied research on compatibility theory of CMP.