To establish a simple, reliable and low cost method for the determination of total flavonoids in Jianer Qingjie SolutionThrough the adaptability of the system, it can be seen that the test substance and the reference substance of rutin have strong absorption at the UV-visible light 500 nm.By drawing the standard curve, it was verified that rutin had a good linear relationship in the concentration range of 0.2053∼1.2318 mg/m L.The precision test shows that the method has good precision.The reproducibility test showed that the method had good reproducibility.The solution stability test showed that the reference solution and the test solution had good stability within 60 min.The recovery rate of this method is good by adding sample and recovery test.The content limit of total flavonoids in this product is: Rutin(C_(27)H_(30)O_(16)) shall be counted as total flavonoids per 1 mL of this product, not less than 0.25 mg.