Abstract: The numerical simulation is applied to the high-rise building setting hole at the different height in class B landform wind field with RNG k-ε turbulence model and wind speed and turbulence intensity parameter are set by UDF programming. The results indicates when the caves are located in the 0.85h, the wind speed weakens in front of the windward side but enhances on the side so that symmetric vorticities are formed on the side, and the wake flow is formed on leeside; In this condition, slit effect is generated inside the cave and the wind speed reaches the top; The different position of the cave has an impact on the wind pressure of the windward and the side, as well as on the base moment of the windward and the side; Since the side wind pressure coefficient is smaller and the largest decline of the base moment drops when the cave is set at 0.65h, it is the most favorable to set the cave at 0.65h.