In the alpine valleys of southwest China, the construction of some large hydropower projects was disturbed by strong winds. The winds exceeding level 7 will affect the operation of the cable crane and the construction of the working surface, and the continuous concrete pouring cannot be guaranteed, which not only affects the construction progress but also seriously affects the construction quality. Considering that Baihetan Hydropower Station will be affected by strong winds without windproof measures, this paper used the three-dimensional computational fluid dynamics method to numerically simulate the wind velocity distribution of the entire dam construction period with the addition of partial windproof measures. The characteristics of the wind field at the dam area and the high and low line feeding platforms were obtained, and the windproof effect of partial windproof measures was analyzed. The study shows that the overall wind speed in the dam construction area decreased with the partial wind protection measures, and the effect was more obvious at the lower elevation of the dam crest, which provided effective protection for the construction area, but the protection effect was weaker at higher elevation. The research results can provide a strong basis for the safe construction and further windproof measures of the project.