It is discovered that the change of wind erodibility of aeolian sand with its grain size complies with discontinuous function, 0.09mm sand being the most susceptible to wind erosion.

• 风洞模拟实验发现：风成沙的风蚀可蚀性随粒度的变化服从分段函数，0.；09mm粒径者最易被风蚀。