Abstract: This paper discusses the origin and application method of the theory of the blood-Qi and the blood-Qi in the six Meridians combined with clinical practice.The theory of the number of blood-Qi in the six Meridians is a multi-level method of syndrome differentiation combining the differentiation of six Meridians and blood-Qi.The six Meridians Syndrome differentiation is beneficial to the accurate location of the disease from the anatomical point of view,and the blood-Qi Syndrome differentiation is beneficial to the accurate determination of the disease from the physiological point of view.The dynamic physiological changes and the characteristics of the six Meridians and the Qi can be reflected through the differentiation of blood-Qi.Yang produces the motion,Yin produces the matter.Through the local shape,quality and movement into the concept of blood-Qi,by the blood-Qi number,not only can the blood-Qi characteristics of the six Meridians be highlighted,but also the local microscopic blood-Qi changes can be inferred from this.Thus diseases can be analyzed from the pathological changes of blood-Qi,forming syndrome differentiation of the blood-Qi,reflect the microscopic level of physiological and pathological changes,as an important method of syndrome differentiation.The combination of six Meridians Syndrome differentiation and blood-Qi Syndrome differentiation can qualitatively locate the disease from multi-level and multi-angle,and can improve the rationality and accuracy of disease diagnosis and treatment.

Key words: the theory of the blood-Qi number in the six Meridians, syndrome differentiation of the six Meridians, syndrome differentiation of the blood-Qi, clinical application