Retaining agents using high water-absorbent resin, it is a kind of water absorbing capacity particularly strong functional polymer materials. Harmless, repeatedly releasing water, absorb water, agriculture people compare it to " micro-reservoirs ". Meanwhile, it also can absorb fertilizers, pesticides, and slow-release, increased efficiency and efficacy. High water-absorbent resin is widely used in agriculture, forestry, horticulture, building materials ; In industry can be widely used in petroleum, chemical, cables, paper, sensors, fire-fighting appliances, fiber products, cosmetics, toys, food preservation, expansion, and so on.