Abstract: China is building a high proportion of new energy system, therefore, the power supply structure, operation mode and system stability characteristics of the system will be fundamentally changed, and the balance between supply and demand will become the primary problem facing the system. This paper focuses on the supply and demand balance of high proportion of new energy systems. Firstly, the main problems and risks faced from three aspects, namely, primary energy supply, flexible resources, and the adaptability of the existing power grid, are summarized. Secondly, the main analysis methods of supply and demand balance of high proportion new energy system are surveyed and summarized, the advantages and disadvantages of each main method applied to the supply and demand balance analysis of high proportion new energy system are summarize and compared, and the applicable scope and application suggestions of each method are given. Finally, the main countermeasures for the supply and demand balance of high proportion new energy system are proposed from the aspects of flexible resource supply, new power grid construction, new energy output and load forecasting, and the establishment of new dispatching system and power market mechanism.