Abstract: With the deepening of China's power market reform, the medium- and long-term transactions in the market are changing to more sophisticated modes. Therefore, it is necessary to establish a more efficient medium- and long-term market with continuous operation to meet the characteristics of the future power systems with multi-functional complementarity, multi-state integration and multi-interaction. Based on this, it is urgent to study and design a new power market mechanism that takes into account both the diversification and the standardization so as to simplify the complexity and facilitate the active participations of various market players in the electricity market transactions. In accordance with the idea of smooth start, orderly connection and easy operation, this paper introduces the concept of "the smallest block" and innovatively proposes the energy block trading varieties that adapt to the domestic conditions in China. We design the standard energy block contracts under an individual trading cycle and, based on this, construct a typical scheme for the continuous operation of the power market in the medium and long term. The case analysis result shows that the proposed scheme is applicable to both the spot pilot provinces and the non-spot pilot provinces. It standardizes the contract performance, stimulates the market vitality, and improves the market efficiency, effectively leading the construction of the electricity market system.