In recent years, the excessive load at peak time affects the stable operation of the power grid. The load aggregator can aggregate loads of users to achieve the goal of peak clipping and valley filling. Based on satisfaction degree of electricity consumption and compensation for users, this paper studies the marginal unit compensation price of interruptible load and transferable load of users. Then this paper puts forward an appropriate compensation mechanism of the grid company to the load aggregator and the load aggregator to users. Finally, the costs and benefits of each participant are analyzed in an attempt to verify the feasibility of the compensation mechanism. The results show that, by load aggregation, all participants can make a profit and carbon dioxide emissions will be reduced.