Diabetic nephropathy is defined that renal glomeruluses are damaged by diabetes melitus and proteins that are not excreted to urine normally are exhausted, or do not excrete waste matter to urine, so-called chronic renal failure state. Clinical stage is explained divided 5. If reached 4 or 5 stage, overt proteinuria is occurred to clinical nephropathy, and hypoalbuminemia, azotemia, hypertension, and edema become serious. Concept about edema is differing comprehension about mechanism of a disease, and treatment methodaccording to Sasang Constitution in Sasang Constitutional Medicine. I treated edemtous Soyangin(少陽人) patient with Dojeokgangkitang(導赤降氣湯) who diagnosed as diabetic nephropathy and wrongly treated in Soeumin. I have got good results, so I do case study.