Zhong Qi can be seen firstly in the book Huang-Di Nei-Jing. Later most of the physicians consider that Zhong Qi includes the spleen and stomach Qi; others think that Zhong Qi does not only include the spleen and stomach Qi, but also contains the liver and gall Qi. The author insists that Zhong Qi which absorbs the food essence and then produces Qi and blood, located in the middle engergizer of human body. Zhong Qi controls the ascending, descending, exiting and entering of Qi activity and it has a transitional connecting function .Five Zang-organs go well as Zhong Qi works.