Wind erosion is one of the main causes of land degradation and one of the most serious problems in the north Ecotone of China.Rhizobia and humic-acid can do better with soil property because it can make the particle bigger,and it will be used as preventing wind erosion availably.The effect of preventing wind erosion and economy are different with other technique,but it has not been studied yet.It will be analyzed the effectiveness of preventing wind erosion with rhizobia and humic-acid based on wind tunnel experiment,and the amounts of wind erosion will be compared with different land type.From the result of analysis,they have some merits.On one hand,it is obvious to prevent wind erosion with inoculated rhizobia and humic acid fertilizer by adding soil particles aggregates,the technique is popularized widely,and the cost is very low(compared to PAM);on the other hand,it can improve the fertility of soil and benefit.