Abstract: To study Miao Xiyong's clinical medication characteristics in the treatment of diarrhea through discussing the diarrhea related medications， medical records， as well as relevant discussions in his extant representative works. His clinical medication characteristics include harmonizing the stomach and tonifying the spleen， ascending lucid Yang and inducing urination; he was good at using simple formulas and learning wildly from other's strong points. He was also good at adopting wind-drugs to treat the syndrome of excessive dampness and Dong-feng(a kind of diarrhea caused by experiencing the pathogenic wind)， and applying dual supplementation of spleen and kidney to treat daybreak diarrhea.