1. Relationship between Qi and Blood
Making Blood
Qi is the motive power for making blood. Qi is indispensable when water and food are changed into food essence; food essence is then changed into nourishing Qi and body fluid; nourishing Qi and body fluid are turned into red blood ; the essence of life is changed into blood, and marrow transforms into blood.

The functions of Qi mentioned above, however, are performed mainly by the functional activities of the relevant viscera and bowels. When Qi is sufficient, the functional activities of the viscera and bowels are full of vigour, and the ability to make blood is also strong. When Qi is insufficient, the functional activities of the viscera and bowels are weak, and the ability to make blood is also weak. Therefore, a deficiency of Qi often leads to a more deficiency of blood. The deficiency of both Qi and blood gives rise to such symptoms and signs as shortness of breath, lassitude, pale complexion, dizziness, dim eyesight, palpitation and others. In treating a deficiency of blood, TCM often adds drugs having the function of invigorating Qi to those having the function of enriching blond.

2. Relationship between Qi and Body Fluid
Qi, the Motivating Power in Promoting the Development of Body Fluid 
Qi is also the motivating power in the development of body fluid. Body fluid is developed mainly through the functions of the spleen and stomach. It, however, has the ability to promote the functions of the spleen and stomach. So, when Qi is sufficient, the functions of the spleen and stomach are sound, and the body fluid is abundant. When Qi is deficient, the functions of the spleen and stomach are weakened, and the body fluid is insufficient. 

Qi, the Motivating Power in Promoting the Circulation of Body Fluid and the Excretion of Water 
The ascending, descending, exiting and entering of Qi is the motivating power for body fluid to be transported, distributed and excreted. There is a saying: "Qi has the function of promoting the circulation of body fluid and the excretion of water." Of course, Qi performs this function with the help of the lung, spleen, kidney, triple warmer, urinary bladder and relevant viscera or bowels.

3. Relationship between Blood and Body Fluid   
Blood and body fluid are both liquid substances. Their main function is nourishing and moisturizing. And they both belong to Yin.

Both blood and body fluid derive from food essence. Fluid in the body seeps constantly into the blood vessels and becomes a component of blood. Blood extravagates out of the blood vessels and turns into body fluid. And this is the reason why there is such a saying: "Body fluid and blood have the same source."