Abstract: This paper aimed to investigate the influence of aeolian sand modifier produced by biomass on soil moisture content at wilting point (SMCWP) and the optimum added quantity. The author investigated the influence of lignin, leather cement and recycled low density polyethylene (RLDPE) through the method of orthogonal experiment. Results showed that the addition of soil modifier had a role in promoting the SMCWP of aeolian sand, and the influencing of leather cement was very significant, while lignin and RLDPE were not. There was a linear relationship between SMCWP and the content of leather cement, and the regression equation was obtained by using stepwise regression analysis method, and the correlation coefficient was 0.962. When the content of RLDPE in aeolian sand was less than 15% (wt%), SMCWP of aeolian sand was improved slightly, while when its content was more than 15%, SMCWP was decreased slightly. When adding ratio of lignin, leather cement and RLDPE in aeolian land was 10%:20%:15%, SMCWP of aeolian sand reached the maximum value which was 23.72%, and the best amendment result was obtained. These results could provide some reference for biomass materials’apply in improving water retention of aeolian land.