Diabetes mellitus is divided into type 1 diabetes mellitus and type 2 diabetes mellitus, type 1 diabetes mellitus and type 2 diabetes mellitus patients die of different causes, type 2 diabetes mellitus patients mainly die of coronary artery disease, myocardial infarction or cardiac failure, and some patients died because of the combination of cerebral infarction or cerebral infarction complicating cardiorespiratory failure, which led to clinical death. Type 1 diabetes mellitus patients mainly die from microvascular complications of diabetes mellitus, mainly refers to diabetes mellitus kidney disease, many patients with renal disease in the late stage of uremia, needing long-term hemodialysis to maintain the treatment, often complicated by cerebral hemorrhage, cardiac failure or pulmonary failure leading to clinical death.