Kidneys have the ability to drain water, and when the kidneys fail, there will be drainage obstacles, and the patient is prone to edema. For the care of edema in renal failure need to pay attention to the following points: 1, to limit water intake. For patients with renal failure, if water is not restricted, the water stored in the body will further increase, and edema will further aggravate, so water intake should be restricted. The daily water intake is standardized by adding 500ml to the previous day’s urine volume. If the edema is more obvious, the restriction should be more strict.2. Limit salt intake. Eating too much salt and drinking too much water are the same effect, both will cause sodium retention, edema aggravation and elevated blood pressure. Therefore, usually eat to avoid too salty, for pickles and other pickled products need to be avoided, the amount of salt eaten per day is best limited to 3g, equivalent to the amount of half a beer bottle cap. 3, correct hypoproteinemia. Chronic renal failure patients are many are loss of appetite, malnutrition, blood albumin will be reduced, albumin is responsible for absorbing water, if the albumin is too low, the water can not be absorbed in the blood vessels, will run to the periphery caused by edema. Therefore, for patients with relatively low protein, they need to supplement protein-rich foods in moderation, such as egg whites, lean meat, fish, etc.