"Medical Doctor Li Dong-Yuan from the Jin-Yuan Dynasties was the follower of Zhang Yuan-Su who used to be the co-founders of Yi-Shuei medical groups. Doctrine of Splenic-Gastric doctrine was written by Dong-Yuan. Central-earth theory represented the Splenic-Gastric system. This medical group refers historically to their idea of splenicgastric supplement. Central-earth simulates the movement of the four-seasons and Arise-Fallen-Float-Sink of Qi as a core medical concept. This concept was yielded from the nature, Yang Qi maintained this lifecycle which initiated in Spring and grown in Summer. Basing on Yin-Yang : 1. Spring-Summer Yang grows and Yin grows as well, 2.body structure and Qi is interchangeable during the four-seasons changes and 3. Sweety-Warmth treatment can expel internal heat. This paper illustrates Yin-Yang from Yi-Jing and central-earth philosophy. There are generate-prevail relationships in the Five-Circuit and redundancy-harmful from five-circuit-six-qi. These concepts explained that Yin redundancy in lower-burner may give internal fire rebound to the upper-burner. This lower-burner fire used to be generated physiologically sometimes refers it to young-yang fire or dragon-thunder fire. While splenic-gastric Qi was weakened by Yang deficiency, gastrium used to refer as the sea of digestions. Illness of the spleen may stop transmit nutrient for the stomach then water-dampness may invade the lower burner of the kidney territory which causes Yin-accumulation or double-Yin. The generate-prevail system mentions that redundancy-harmful mechanism is initiated then the double-Yin may rise to Yin-fire offensively. This paper focuses on yin roots on yang, the two internal fires (young-yin and young-yang) both are rooted from the lower burner which refers to physiological fire in Nei-Jing. While double-yin formed which may give pathological fire to fight back. Understanding this Five-Circuit and redundancy-harmful theory, we grasp more easily and essentially to the medical treatment concepts of the Jin-Yuan scholars."