Based on a social welfare maximization model, the electrical appliances can be divided into general electric and alternative energy electric equipments. By improving the social welfare maximization model for the electrical appliances, which can use different types of energy through the coefficient of energy conversion, users were allowed to compare and real-time judge the pricing strategy of the energy consumption. According to the released information on the smart meter of electricity supplier, such as the real-time electricity price, electricity consumption, etc., users compare the electricity price and the price of alternative energy (fixed price) and judge to switch to the optimal way of energy using for the intelligent devices at that time period to maximize their own social welfare. Dynamic simulations by using the model before and after improvement were carried out and the comparison was made between the results. By virtue of the flexibility to change the type of energy being used,the fluctuation of real-time electricity price is lesser, and the flexible load at peak time can be reduced so as to achieve peak sharpening effect.