Primary diabetes mellitus is diabetes mellitus whose cause is not yet known. Primary diabetes is a hereditary disease, and most diabetes is primary. Primary diabetes mellitus can be divided into type 1 diabetes mellitus and type 2 diabetes mellitus. type 1 is also known as insulin-dependent diabetes mellitus, most common in adolescents, the onset of disease is acute, severe, rapid development, blood insulin is lowered, prone to ketoacidosis, coma can occur in severe cases, the treatment is dependent on insulin. type 2 is also known as insulin non-dependent diabetes mellitus or adult-onset diabetes mellitus, which accounts for approximately 90% of diabetes mellitus, most common in adults, the disease is slow to begin. The disease is mild, the development is slow, the blood insulin can be normal, increase or decrease, obesity is common, not easy to appear ketoacidosis, the treatment generally do not use insulin, through the diet, exercise, oral hypoglycemic drugs to control blood sugar.