Potassium deficiency in diabetes mellitus should firstly identify the cause of the disease and then treat the cause of the disease. Potassium can be replenished through food and medication, in addition to active treatment of the primary disease, it is recommended to follow the doctor’s instructions. 1. Food: Eat potassium-rich food such as spinach, seaweed, lean meat, etc., so as to increase the intake of potassium, the source of potassium in the body increases, and the blood potassium will naturally rise. 2. Drugs: Oral potassium supplements such as potassium chloride extended-release tablets can be taken. If there is severe hypokalemia, potassium supplement can be given by intravenous drip. It is recommended to take potassium supplement under the guidance of doctor. 3. Treatment of primary disease: Commonly used drugs for diabetes such as metformin and pioglitazone. If the blood potassium of diabetic patients is low, they should go to the hospital in time, and do not use medication by themselves, so as to avoid delaying the condition or having adverse reactions.