Abstract: The distribution of vertical wind velocity in typical hilly terrain is studied by the combination of wind tunnel test and numerical simulation. In the wind tunnel test, the terrain B wind field is simulated. The vertical wind velocity profile of a typical steep hill with a certain mountain length is measured by Series 100 Cobra Probe. The vertical wind velocity distribution at a height of 10 m above the ground is obtained. The CFD simulations of typical hill models are carried out to study the distribution of vertical wind velocity under different hill heights, slope ratios, mountain lengths and wind direction angles of the along mountain ridge (0°) and vertical to mountain ridge (90°). In this research, it is found that the CFD results are in good agreement with the experimental results; the vertical wind velocity is larger than 60% of the income wind speed on the windward slope at 10 m high from the ground; the maximum vertical wind velocity appears in the area above 2/3 height of the windward slope. Under the wind direction vertical to mountain ridge, the maximum vertical wind velocity on the windward slope and the mountain top increase with the length of the mountain ridge. Under the wind direction along the mountain ridge, the maximum vertical wind velocity on the windward slope decreases with the mountain ridge length. The maximum vertical wind velocity at the top of the mountain is slightly affected by the mountain ridge length. This study concludes that vertical wind velocity should be considered in the windward slope position above 1/3 mountain height, and the vertical wind velocity at the mountain top needs to be considered when the ratio of mountain height to mountain bottom diameter is greater than 1:5.