The comprehensive utilization of fly ash mainly concentrated is in construction engineering channels, road engineering, it used to deal with waste water is full of hope. As this, it can achieve the purpose of using the waste to conduct waste. Fly ash was modified by a microwave radiation. This method was simple and easy to operate . When the dosage of Modified fly ash is 4g, the pH value is 6.2, the mixing time is 50min, the initial concentration of copper solution is 1.85mg/L ,Adsorption rate of modified fly ash on Cu2+ reached 96%.