Based on the status quo of wind-sand disaster along the Heifengkou section of the S315 highway in Inner Mongolia,China, this paper measured the flow field variations of the highway subgrade with different slope angles by Pitot tube. Furthermore, the paper also discussed the formation mechanism of the disaster on desert highway by analyzing the flow field distribution, wind velocity profile and wind speed reduction rate. The results indicate that slope angles have an important influence on the range of sand accumulation area on both sides of the subgrade and the erosion intensity on subgrade. Under a certain wind velocity, the larger the slope angle is, the more broadly the scope of sand accumulation on both sides of the subgrade turns, then the corresponding protection scope tends to be increased. When the slope angle of the subgrade is constant, the range of sand accumulation on the leeward side of subgrade may increase with the increase of wind speed, and the expansion trend becomes less apparent as the slope angle (34° and 40°) becomes larger consequently, resulting in a large amount of sand accumulates near the foot of the larger leeward slope, which needs to set a few more sand-blocking fence and sand-fixing grid on leeward side of the subgrade with larger slope angle, used to reduce wind speed and control sand. The wind erosion effect on the foot and shoulder of the windward slope is the strongest among all measuring points, so in order to prevent the subgrade collapse, the foot and shoulder of the windward slope should be focused on building protective engineering.
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