In order to evaluate the simulation capability of the National Numerical Wind-tunnel CFD software PHengLEI for subsonic flows over the complex high lift configuration, the 2nd AIAA High-Lift Prediction Workshop DLR-F11 configuration is selected and simulated. The grid convergence analysis, the Reynolds number effects and the influence of the slat track as well as the flap track faring are presented. The comparison with the experimental data and reference values indicates that the results have good credibility and validity in the linear segment before stall, and the results near angle of stall agree well with reference values. With the additional components of the slat track and the flap track fairing, separated flow features on the wing can be correctly captured.