Abstract：The fly ash is a kind of solid waste produced by the power plant and stored in some places，but its influence is the most serious on environment now. In the past，the aim to construct storing sites is to prevent the fly ash from entering the surrounding or polluting the running water. Because of the improper design，construction and operation of storing site it is serious that the fly ash entering the air or the infiltration ash-water entering underground pollutes the air and the groundwater. It is emergency on solving it. Through mechanism analysis and testing of fly ash，bentonite and lime，a new material mixing fly ash，bentonite，lime and clay is developed to prevent the seepage of ash-water. It can be paved at the bottom and inner slope of embankment surrounding the storing site. The new material is analyzed by testing comparison of technical features such as compression strength，impermeability，frost resistance，dry or wet resistance and acid or alkali environment of mixing material；the economic mixing ratio is raised to offer scientific foundation for the application of the project technology.
