In general drinking more water cannot effectively lower blood sugar, water does not contain substances that lower blood sugar. Diabetic patients drink more water than the general population, because glucose can not be used, with urine excretion produces osmotic diuresis, the body urinates more, in order to replenish the body’s water loss, drinking more water. Water is an important component of the human body, participating in the body’s sugar metabolism, fat metabolism, protein metabolism, as well as lubricating the body, maintaining body temperature and other roles. If diabetic ketoacidosis occurs, the body’s water deficiency becomes more pronounced, and the patient becomes dehydrated, with reduced skin elasticity and deep sunken eye sockets. Especially in the acute complications of the onset of increased water needs, when it is necessary to quickly replenish a large amount of fluid, which is conducive to the excretion of metabolic toxins in the body. However, drinking water does not achieve the effect of lowering blood glucose. Lowering blood glucose requires reducing the intake of sugar substances and controlling the total calories eaten daily. It is also necessary to increase exercise to make peripheral tissues, especially muscle tissues, more sensitive to insulin, so as to achieve the effect of lowering blood glucose. In addition to diet and exercise treatment, pharmacological intervention is also required, including treatment with oral hypoglycemic drugs, insulin, and herbal medicine. No matter which method of treatment is used, the choice should be based on a combination of liver function, kidney function and insulin reserve function.