Flexible resources are one of the important means to support the operation of new power systems in the future, which can effectively address the consumption problems brought by the high proportion of new energy grid connection. Scientific and reasonable information disclosure indicators are of great significance for promoting the utilization and development of flexible resources. Therefore, the article analyzes the requirements for information disclosure of flexible resources participating in the power market under the new power system. Using a combination of overall and individual ideas to construct power market information disclosure indicators considers flexible resources, constructing them from the perspective of the overall power system. A power system flexibility demand index considers renewable energy output fluctuations and load fluctuations and constructs an index covering the supply side, demand side and energy storage side from the perspective of power market participants to evaluate the adjustability of flexibility resources. Finally, this paper would conduct a case analysis on the power market information disclosure indicators of flexible resources, evaluating the flexibility of the power system and putting forward relevant suggestions for the design of Chinese power market information disclosure indicators in the future under the new power system.