Drought insurance agent, also known as agent for preserving soil moisture, transpiration resistant agent, the fertilizer storing storage agents or mini reservoirs is a unique three-dimensional network structure of the organic polymers. In the soil to rain or irrigation water absorbs quickly and keep the change to solid water and no flow no seepage loss and maintain long-term local humidity, drought slow release for plant use. Its unique absorbent, water storage, the water retention property, in improving the ecological environment, windbreak and sand fixation engineering to determines the success or failure of the role. Widely used in land desertification control, agricultural and forestry crops planting, landscaping and other fields. Is the world recognized for fighting drought and preserving soil moisture is the most effective micro irrigation water activities, social save large amount of irrigation water and irrigation maintenance labor