Uric Acid produces allantoin, CO<sub>2</sub> and H<sub>2</sub>O<sub>2</sub> under the action of Uricase, and H<sub>2</sub>O<sub>2</sub> can produce red quinone imide compounds under the action of color developer, whose color depth is proportional to the H<sub>2</sub>O<sub>2</sub> content, and has the maximum absorption at 510 nm wavelength, so as to calculate the uric acid content.