Abstract: It is essential to construct an electricity spot market mechanism that effectively reflects the power spatial-temporal balance costs for supporting the development of the new type power system dominated by renewable energy. In such a power system, the traditional electricity spot market mechanism faces the following problems. 1) The near-zero marginal cost of renewable energy may cause the disappearance of spot price signals, which will erode the market regulation role of price signals; 2) It is hard to show the differences of the power supply services between the renewable energy and the flexible resources, leading to the behavior of "free riding" of some resources and the violation of the incentive compatibility. To address the aforementioned market failure problems, the mechanism of the electricity spot market with decoupling of renewable energy and flexible resources is proposed. In the temporal capacity market for renewable energy, the fixed costs of renewable energy are daily allocated to form the spatial-temporal capacity price signals. For the spot market for flexible resources, the value of surplus power balance services such as energy deviation balance, the frequency regulation, and the reserved are discovered through competition. The renewables and the load consumers are responsible for paying the power balance costs to incentivize the flexibility of the power system, which conforms to the incentive compatibility principle.