Potassium supplementation for diabetic patients depends on the severity of potassium deficiency. If it is mild potassium deficiency, you can choose food potassium supplementation, while severe potassium deficiency should choose oral potassium supplementation, intravenous potassium supplementation, and also needs to be treated for the cause of potassium deficiency. Patients with potassium deficiency can be given some potassium-rich foods for potassium supplementation, such as spinach, cauliflower, peanuts and so on. Fruits such as bananas and mangoes are also rich in potassium, but they are not recommended because of the high sugar content and diabetic patients should control their sugar intake. If patients can take it orally, they can choose oral medication for potassium supplementation, such as potassium chloride extended-release tablets, as prescribed by the doctor. Patients with severe hypokalemia who cannot eat can receive intravenous potassium supplementation. Intravenous potassium supplementation should be based on urine volume, and usually starts when the urine volume is greater than 100 ml. Potassium supplementation needs to be monitored to avoid cardiac arrest due to high potassium levels. In addition, it is also necessary to treat the primary causes of low potassium, such as malnutrition and aldosteronoma. Patients with diabetes mellitus who find low blood potassium should go to the hospital in time to get a clear diagnosis and be treated under the guidance of the doctor.