To reveal the characteristics of dust emission caused by wind erosion of soil in the cultivated land, an indoor simulated wind tunnel experiment was conducted. In this study, we used soils sampled from the different cultivated land in the northern and middle Ningxia Autonomous Region to investigate the effect of wind speed on the dust emission. The PM10 concentration was monitored and then the PM10 flux was calculated basing on the concentration to compare capability of dust emission. The results showed that dust emission in the cultivated land was a instantaneous process which completed as soon as soil exposed to the wind. The trend of accumulated max PM10 flux was complicated since the largest increase of PM10 flux of PL occurred when the wind speed increased from 6 to 9 m/s, while the largest increase of PM10 flux of TX and YC occurs when the wind speed increased from 15 to 18 m/s. The accumulated average PM10 flux of every soil increased with wind speed in a similar trend which are quadratic functions. There was a logarithmic regression between average PM10 flux and amount of wind erosion. The capability to dust emit of four soils listed in the order of PL＞TX＞YC＞YN when the wind speed higher than 9 m/s.