“This study reveals the coupling relationship between wind erosion sensitivity and soil particle size characteristics under the control of "narrow pipe effect" in the middle and lower reaches of the Yarlung Zangbo River valley. Based on the dynamic model of wind sand based on the soil particle size composition of different wind erosion underlying surfaces and the optimization of environmental factors, it can reveal the coupling response mechanism of sand onset wind speed threshold and sand transport flux, and provide data support for the assessment and prediction of sand dust release potential in the plateau valley.”