A normal adult needs 2.5 grams of potassium per day. Natural foods are rich in potassium, with 2-4 grams of potassium per day available in an average diet, which can fully meet physiological needs. After entering the body, about 90% of potassium is absorbed by the intestine in a short time, while the rest is excreted in the feces. After participating in cellular metabolism in the body, potassium is excreted through the kidneys, intestines and sweat glands. In patients with chronic renal failure, the ability of the kidneys to regulate potassium metabolism is significantly reduced, making it difficult to maintain the balance of potassium metabolism in the presence of increased acute endogenous and exogenous load, and hyperkalemia develops. The most important danger of hyperkalemia is to cause serious consequences such as heart rhythm disturbance, blood pressure reduction, cardiac arrest and respiratory arrest. ECG examination can help to diagnose hyperkalemia. When the blood potassium is higher than 6 mmol/L, there are typical high sharp T waves in leads V1-V4 of the ECG, prolonged Q-T interval, reduced P and R waves, widened QRS waves, and depressed S-T segment. Meat, beans, vegetables and other foods in the daily diet are rich in potassium, followed by rice and noodles, and less eggs. Among them, shrimp skin, soybean, black bean, mung bean, lily, cicely, yellow cauliflower, red amaranth, tomato paste (canned), purple cabbage, squash, pickled potherb mustard, dried mushroom, dried mushroom, fresh date, dried red date, grape, dried peanut kernel, tea, whey cream, vinegar and other foods are high in content and should be consumed with caution by patients with chronic renal failure.