The academic origin of "homogeny of spleen and pancreas"is explained from the aspect of Chinese medicine. The authors think "spleen failing to spread essence"is the basic pathogenesis to diabetes mellitus. Spleen function of spreading essence is impaired. Thus essence of water and grain could not be spread in the whole body but amass "sugar-turbidity"

which manifests high blood sugar. Differentiating diabetes mellitus from the viewpoint of spleen

invigorating spleen and benefiting Qi could help spleen to ascend clear. Invigorating spleen-yin and clearing endogenous heat are used. The liver and kidney should be considered. The methods of dissipating phlegm and activating blood circulation could be combined. The treating idea of"treating spleen is treating pancreas"should be used in preventing and treating diabetes mellitus.