1, the heart is the master of the blood veins, the veins belong to the eyes “Suwen – five viscera generation chapter” said: “the blood, all belong to the heart”, “the heart of the joint pulse also”, “all the veins, all belong to the eyes”. The Su Wen – The Essence of the Pulse says: “The pulse is the house of blood”. From this, it is clear that the heart is the master of blood in the whole body, the blood in the veins is pushed by the heart qi, circulating throughout the body and transfusing upward to the eyes, and the eyes are nourished by blood to maintain vision. 2, the heart is the master of the hidden gods, the eyes for the heart to make the “bier – the great confusion” said: “the eye is the heart of the make, the heart is the god of the house also”. Here the “God”, refers to the human spirit, thinking activities (actually the function of the brain). Because God is hidden in the heart, its external use lies in the eyes, so the eyes can see, subject to the heart. The “Review of the Yaohuan – Eye as the most precious” also says: “The mind and the spirit in the eye, hair for the divine light, the divine light deep in the pupil of God, in order to see everything clearly.” In addition, “Su Wen – Interpretation of Essence” also says: “The heart is the special essence of the five viscera, and the eyes are its orifices. As the heart is the main of the five viscera and six internal organs, the internal organs are supported by the essence, and the vision is governed by the heart and mind. Therefore, the vitality of the internal organs of the human body, as well as the state of mental activity, can be reflected in the eyes, so the eyes and the heart outside the orifice. This theory also provides an important basis for the Chinese medicine diagnosis of “looking at the eyes and checking the mind”. 3, the relationship between the eyes and the small intestine people eat water and grain, the stomach cooked, passed into the small intestine, the small intestine is further digested, divided into clear and turbid. Its clear, including fluids and water and grain essence, from the spleen to the whole body, so that the eye is nourished. In addition, the heart and small intestine viscera together, the veins of each other, mutual circulation, so the normal function of the small intestine, both related to the heart, but also affect the eye.