Liuhe refers to the knowledge of the unity of heaven and man and the balance of yin and yang. The six directions of heaven and earth overlap, that is, the six directions of nature. The twelve meridians of human body is combined from exterior to interior, that is, six yin and six yang embrace each other, which is the basis of smooth qi and blood. The six-in-one in boxing is divided into inner trinity and outer trinity, which is in harmony with the shape and meaning of hand, eye and body. The six-in-one is to guide breathing and breathing with the form and meaning of the human body, and to get through the the twelve meridians of the human body in six dimensions. In order to achieve the realm of self-cultivation and harmony between man and nature.