If there is white precipitation after urine sedimentation, then the possible causes are: 1, salt urine, urine because the composition of the salt is oversaturated and precipitated to form crystals, after the relevant urine is left to sedimentation, there can be crystalline precipitate as white particles, need to carry out urine routine and urine sedimentation examination, clear whether there is crystalline material elevated. The urine is usually heated and disappears after drinking more water, without any urinary tract irritation. 2. When there is a urinary tract infection, there is more pus, cellular metabolites or shed epithelium in the urine, which may appear as white sediment after sedimentation, accompanied by cloudy urine, frequent urination, urinary urgency, painful urination and other symptoms. 3. If a patient has had urinary stones, fine grains of debris will be discharged and white sediment will be seen after precipitation, mostly accompanied by pain in the lower back and abdomen. Ultrasound examination of the urinary tract can reveal the presence of stones in the urinary system.