In order to seek the better mode of retail electricity market， referring the retail mode of other trades， a price-difference-type service pattern that pays equal attention to power price and additional value are proposed in the hope of better realizing the win-win of seller and purchaser parts. Therefore， around the power commodity additional value， a novel power distribution and consumption concept based on power supermarket is proposed after summarizing the power quality service under the united dispatching way and analyzing the limitation of the current embryonic form of power price-difference-type retail trade. The definition and core idea of power supermarket are clarified in detail， and stressed the characteristics of power supermarket to satisfy the businessmen's benefits and enable the consumers to gain the power commodity with highest performance-to-price ratio at the same time. On the basis of building the theoretical framework of power supermarket， the construction principle， the implementation and supervisory principle， the transaction mechanism， the trading price formulation rule， the compensation mechanism of power supermarket and the arrangement principle of the equipment to guarantee the supplementary value of power goods are elaborated.