Abstract: In order to solve multi-pathtoll distribution problemin china, we presented a pathflowesti mation model by observedlinkflow.The model assumed that the travelers follow stochastic user equilibrium in choosing paths, and then an augmented Lagrangian dual algorithm was used in solving the problemof path flow.Finally, survey data of pathflowon Southern expressway network of Jiangsu Province of China was used to verify the correctness and effectiveness of the proposed method.The correlation coefficient of the true and esti matedlink flow amounted to 99%, and the correlation coefficient of the true and esti mated path flow amounted to 90%.