Urine analysis specific gravity is divided into morning urine and random urine, the normal reference range of morning urine is between 1.015-1.025, and the normal reference range of random urine is between 1.003-1.035, but the standard is not the same in every medical institution, so it is recommended to take the standard issued by local hospitals as the standard. If the urine specific gravity value is less than the normal range during the examination, it may be caused by the poor concentration function of the kidneys or renal failure, especially in the polyuria or urolithiasis stage, which will excrete a large amount of urine, and then the urine specific gravity will be lower. If the specific gravity of urine is greater than normal, it may be triggered by the concentration of urine caused by drinking too little water, and this state is more likely to cause infections or the onset of stones. If the specific gravity value of urine analysis is abnormal, the patient also needs to go to the hospital to improve the relevant examination, because the specific gravity value of urine analysis caused by abnormal causes are more, need to clarify the cause of the cause of the treatment under the guidance of the doctor.