Abstract: This study describes the four characteristics of the classic formula and syndrome, including authentic and reliable, objective and easy to learn, vivid and expressive, as well as intuitive and simple. The above four characteristics reflect the unique charm of the classic formula. In terms of the classic formula, it is not only the core technology of clinical practice in traditional Chinese medicine (TCM), but also the carrier of TCM mode of thinking, and the inheritance and innovation of TCM. Thus, it is vital to pay attention to the teaching and research of the classic formula and syndrome.