Abstract: In order to improve the shortcoming that the BaSO4 suspension cannot be stably and evenly formed by SO^2-₄ for a long time in the lixivium containing uranium with the use of BaSO₄ turbidimetry, the impact of different wavelengths, acidity, stabilizers and the dosage of ethyl alcohol absolute on the stability of the dispersed system of BaSO₄ by using light absorption turbidimetry was analyzed, which is to improve the accuracy of the measurement. The results show that the best experimental condition for the system which measures the concentration of SO^2-₄ by using the improved turbidimetry is the system which include 1.0 mL HCl(3 mol/L) , and 5.0 mL 50 g/L ［C₂H₄O］n(containing w=10%BaCl₂•2H₂O) and 3.0 mL CH₃CH₂OH. The concentration of SO^2-₄ conforms to Beer Lambert law in the range of 0.2-1.5 g/L when being at 440 nm of the optimized wavelength. The detection of this method is limited to be 0.003 6 mg/L and the limit of the ration is 0.012 0 mg/L(n=20). The recovery rate of this method is 99.0%-99.8% and the relative standard deviation is 0.63%-2.44% (n=2). Compared with GB/T 5750.5—2006, this method is easy to operate and it is quick. What’s more, the accuracy of the results is high. Therefore, there is a promising future for this method to be applied widely in the measuring of the concentration of SO^2-₄ in the lixivium in CO₂ and O₂ in-situ uranium mining.