A layer of oil on top of the urine is most common in patients with high blood lipids. Because of the increase of blood fat or usually eat more greasy food, oil will be filtered from the glomerulus into the urine, which leads to the phenomenon of oil on top of the urine. Kidney disease can also lead to a layer of oil on the urine, such as nephritis can lead to excessive protein in the urine, resulting in a layer of oil on the urine. Celiac disease can also cause this phenomenon, because the urine contains celiac fluid, the main component of celiac fluid is also oil, so there will also be a layer of oil on the urine. If this phenomenon occurs, it is recommended to immediately go to the hospital urology department to check the urine routine, renal function, blood lipids, to find out the cause of the disease and then take targeted treatment. Drink more water during the treatment, the diet should be light, avoid eating spicy stimulating, too greasy food.