ABSTRACT
[Objective] To guide the clinical application of Fuyang medicine through the study of San Jiao Theory of ZHENG Qin'an [Method] To study the foundation theory of ZHENG Qin'an and correlate the evidence with the concept of original yang, San Jiao, Emporer fire, Minister fire and middle earth. To explain the unity and inter-relation of San Jiao and the symptons of yang deficiency of San Jiao and the approach of the use of medicine with the support of case studies. [Result] Zheng Qin'an suggested that three Jiaos are of one Jiao. The yang of upper jiao is governed by Emperor fire while that of lower Jiao by Minister fire. The two fires are of one fire. The circulation of the two fires generates the middle earth. When the middle yang fails on circulating the upper and lower Jiaos cannot communicate. The root of original yang is the kidney which is nourished by the spleen. The unity of San Jiao, the use of lower yang as the root of upper and middle yang and the use of the circulation and root nourishing action of middle yang are the keys to application of medicine. [Conclusion] The use of medicine of ZHENG strongly adhered to the qi circulation of San Jiao. It showed to the later generations a simple but comprehensive thought of Chinese medicine. It was an important guidance for the use of Fuyang medicine.