Edema is one of the most common clinical symptoms of renal diseases, and its pathogenesis is more complex, although modern medicine in the course of treatment has achieved a certain effect, but a large number of hormones and immunosuppressants, making the condition easy to repeat, while the side effects are relatively large.TCM classifies renal edema as "water-qi disease".This paper discusses the etiology, pathogenesis and treatment principle of renal edema from the perspective of TCM syndrome differentiation and treatment.The treatment method, Yang water should be sweating, water or attack, mainly to dispel evil, and at the same time with the method of clearing heat and detoxifying, strengthening spleen and regulating qi; Yin water should warm the kidney and strengthen the spleen, mainly to support the right, and at the same time with water, nourishing Yin, promoting blood circulation, removing blood stasis and other methods, The combination of traditional Chinese medicine and Western medicine has a remarkable effect on renal edema, in addition, it also enriches the treatment idea of renal edema.