Abstract: The construction of a new power system is crucial for achieving carbon peaking and carbon neutrality, and the exploration and evolution of the construction paths of the new power system is the top priority. Starting from the interconnection pattern of my country's power system, this paper focuses on the systemic problems and challenges such as the supply security, balance adjustment, and power supply costs faced by the construction of a new power system. We adopt a source-grid-storage collaborative planning for the wide-area power systems considering various flexibility constraints. Based on time series simulation and aiming at the lowest total system costs, we take into account the resource-grid-storage planable capacity, the proportion of new energy power generation, and the timing operation characteristics of various source-grid-storage equipment, etc. Combined with the existing research plans, this paper systematically analyzes the installed capacity of the wind power, the photovoltaic new energy sources and the new energy storage in China's seven regional interconnected power systems in 2025, 2030, 2050 and 2060. On this basis, we analyzes the technical and economic indicators in the domestic interconnection system at different level years such as the installed capacity and proportion of new energy sources, the amount and proportion of new energy power generation, the installed capacity and proportion of energy storage at different time scales, the utilization rate of new energy sources, the cost of power supply, the output proportion of synchronous machines and carbon emissions, etc. By summarizing their development and evolution trends, this study provides the technical and decision-making reference for the construction of a new power system, strongly supporting my country's strategic goal of achieving carbon peaking by 2030 and carbon neutrality by 2060.