The current tiered electricity pricing (TEP) system for residents in China reflects neither the cost of electricity supply nor the real demand of residents of different household sizes; therefore, we design a classified self-selection sales electricity pricing (CSSSEP) mechanism for different household sizes in this paper. First, based on the log-log model and single threshold model, residential electricity demand models of different household sizes are constructed. Then, the combination of factors other than electricity price is regarded as the residential electricity con-sumption type, and o...