Factors affecting the glomerular filtration rate are the perfusion rate of the blood in the kidney, the colloid osmotic pressure of the blood, and the pressure in the glomerular capsule lumen. Glomerular filtration is accomplished through the glomerular filtration membrane, one side of which is the capillary and the other side is the renal capsule lumen, and the blood is filtered from the capillary side to the renal capsule lumen side. If the patient’s blood pressure increases renal blood flow will be more adequate, the perfusion pressure of the renal artery will increase, the filtration rate will increase. If plasma albumin decreases, the colloid osmotic pressure in the blood decreases. The main function of colloid osmolality is to absorb water in the blood vessels, after the decrease of colloid osmolality water can not be absorbed will be transferred to this side of the glomerular capsule lumen, the filtration rate will increase. If the pressure of the glomerular cystic cavity increases, the glomerular filtration rate will decrease. The factors that can cause the pressure of the glomerular cystic cavity to increase are mainly the obstruction of the urinary tract, such as kidney stones or prostatic hyperplasia caused by hydronephrosis.