In the oliguric stage of acute renal failure, the treatment should be based on the guiding principle of fluid out as in, and at the same time, the patient’s infection and other factors can be effectively prevented and treated. In the oliguric stage of acute renal failure, excessive water intake can lead to edema, such as pulmonary edema, impaired cardiac function and other related complications. When the patient consumes too much water, it can lead to the patient to appear more obvious dilutional hyponatremia, at the same time, if the patient’s volume load is too much, that is, too much water intake, it can lead to the body’s volume load is too much, in this case it can lead to the body’s cardiac function to appear serious damage, it can appear cardiac insufficiency, acute pulmonary edema and other related complications. In the oliguric stage of acute renal failure, it can lead to more obvious metabolic acidosis, ionic disorders and other related complications. Therefore, in the oliguric stage of acute renal failure, the water intake of patients should be controlled, and diuretics and hemodialysis can be taken to eliminate the excess water in the patient’s body.