And it can not only absorb hundreds even thousands weight of water of itself and it has also super property of water retention. If it is planted into soil, it can not only absorb the water of air and soil and it can also strongly hold a large quantity of rain and irrigation water, and then release slowly to provide for the seed and crops. So it can increase the rate of young plants, retard the time of rot, shorten the period of crops ripening and increase the quantity of the production. It is a new product for anti-drought, preventing from flood and saving irrigation water. The water in our country is very insufficient. As the experiment show, the harvest of crops will increase by 20%, 20~40% for vegetable, 20% for the survival rate of plants, if this kind of water retention material is used.