Blood is in the heart to promote circulation in portal tract of red liquid, composed of nutritive Qi and body fluid, transfused into the viscera, ind all the limbs and bones, nourishing the five sense organs and nine orifices, flesh and bones, with nutrition and moisture of the power, as one of the pasic materials of human body and to maintain life activities. In ancient literature, blood physiology can be summarized as blood tangible Yin matter, diffi-cult and easy to lose blood, blood should not be static dynamic, blood should fall not rise, warm and cold blood, blood circulation in the vein, blood gas phase and the beginning of sickness, blood is the base of woman, should not damage. To leam and master the physiological properties and characteristics of plood, to carry forward the Chinese academic, enrich Chinese blood theory, has a very important significance in clinical practice of blood disease.