Slope farmland is the main source of soil erosion. Non-point source pollution will be reduced and soil structure will be improved if soil erosion of slope farmland is controlled effectively. In this study, the performance of soil against erosion and the growth indexes of soybean and maize (plant height, maximum net photosynthetic rate and stomatal conductance) under different W-OH concentrations were investigated. Results showed that the response to W-OH solution treatment was different between soybean and maize; soybean and maize growth varied depending on the concentration of W-OH. In general, W-OH solution treatment enhances the resistance of soil against erosion. In the presence of low W-OH concentration, soybean and maize grew better; while in high W-OH concentration, the growth of soybean and maize were inhibited or they even died. Therefore, reasonable concentration should be designed when W-OH solution is applied to slope farmland. The research finding will provide reference for the follow-up application of new materials to water and soil erosion prevention.