Abstract:The analyses on water characteristic curves and water constants of soils made from several common modified materials with different ratios showed that RETC software well simulated the parameters of van Genuchten equation for water characteristic curves (all R2>0.99). Soil field water capacity reduced but soil water availability increased with the increase of sand content. Sand grain size influenced soil moisture constant insignificantly. The greenery waste increased soil field water capacity and available water content, but decreased wilting water content. The greenery waste increased the proportion of available water in field water capacity, which reached to highest (49.59%) in soils with 20% proportion of greenery waste. Although PAM increased soil field water capacity, it inhibited the release of soil water, thus reduced the effectiveness of soil water. In addition, desulfurization gypsum increased soil field water capacity and soil water effectiveness. In general, the best soil was composed with 70% soil, 10% sand, 20% greenery waste and 0.5 kg/m3 desulfurization gypsum in volume.