The color of urine is clear and transparent. The color of urine is also affected by the medications and food taken during this period, and can appear yellowish. It is important to distinguish between normal changes in urine and pathological changes. 1, fresh urine if cloudy, to consider the presence of urate or phosphate precipitation, acidic urine can be found after cooling light red crystals. Alkaline urine can have grayish-white crystals precipitated and produce bubbles when acid is encountered. Yellow color can appear after taking vitamin preparations, and orange-red urine after taking rifampin. Urine color deepens after taking phenytoin sodium. 2, pathological urine color change: (1) there are red cells in the urine is called hematuria, like washing meat water-like, light red cloudy. (2) There is hemoglobin in the urine can show a thick tea color, or soy sauce color. It is seen in intravascular hemolysis and transfusion reaction. (3) Bilirubinuria is the presentation of soybean oil-like changes, seen in jaundice. (4) Pusuria is the presence of a large number of pus cells in the urine and appears cloudy or cloudy. The observation of urine, together with other auxiliary laboratory tests, can play a role in the diagnosis of the disease.