Abstract: There is a decay phenomenon that the value of turbulent kinetic energy in the outlet is inconsistent with that given in the inlet when simulating the atmosphere boundary layer with the standard k-ε turbulence model. This paper uses different turbulent viscosity updating methods to research the sustainability of the equilibrium atmosphere boundary layer,then selects the better sustainable equilibrium atmosphere boundary layer methods combined with the solution of the BIA problem to simulate the wind flow over complex terrain,and finally based on the numerical simulation results,the effect of wind flow over complex terrain on wind turbine siting is analyzed. The results show that the wind profile at the outlet,the turbulent kinetic energy,and the dissipation rate can keep a high consistency with the given initial values at the inlet by selecting appropriate turbulent viscosity updating methods,roughness treatment methods,and the source terms of turbulent kinetic energy and dissipation rate. The introduction of the BIA problem-solving method can further improve the accuracy of numerical simulation of complex terrain. The wind turbines are preferably installed at the top of the mountain,avoiding the leeward area of the mountain with large turbulence,and the layout of wind turbines behind the mountain should be considered in combination with the wind turbine wake at the top of the mountain and the influence area of the mountain.