Diabetes mellitus is the most important predisposing factor for end-stage renal disease. In 2015, the proportion of patients with end-stage renal disease due to diabetes in Taiwan is 45.3%. The main clinical features of diabetic nephropathy include a decrease of estimated glomerular filtration rate (eGFR) and albuminuria, and the latter is significantly associated with the former. However, many studies have suggested that diabetic patients can have a decline of eGFR even if they do not have albuminuria. The predominant risk factors for developing diabetic nephropathy are hyperglycemia and hypertension, and how to control blood glucose and blood pressure has become the centerpiece of treatment for diabetic nephropathy.