The loess gully area is characterized by the climate of 9 drought years out of 10.In order to realize the maximum utilization of rainwater resources,the catchment used for afforestation experiment was treated with several kinds of common and new materials with the function of seepage prevention and suitable treatment methods were selected.They include spraying methyl sodium silicate,spraying RG-100C1 macromole emulsion,spraying 3F gram waterproofing agent,mixing 3F gram waterproofing agent,spreading cement,and spraying water.Through the analyses of various research methods,spraying methyl sodium silicate is found to be the best in collecting water and thus,has a greater value in extension.