Based on actual state of serious loss of soil and water, complicated terrain and discommodes transportation, the design of spraying polymers of different consistencies on sloping field to promote the efficiency of rainwater catchment materials was put forward. By the rain-simulated experiment, time of runoff yield, efficiency of rainwater catchment and the soil erosion was discussed after three treatment with soil consolidator, organic silicone and asphaltum on sloping field. The results should indicated that macromolecule polymers applied on sloping field can quicken time of runoff yield by 81.2%, advance efficiency of rainwater catchment by 72.0% and reduce clearly soil erosion. Among three treatments, order of efficiency of rainwater catchment is soil consolidator, organic silicone and asphaltum. So studying macromolecule materials is very significance to develop new-style materials and form of rainwater catchment in northwest area.