Abstract: The rapid development of new energy in our country highlights the contradiction between the difficulty in consuming and ensuring the supply of electricity when new energy is abundant and when new energy is scarce, which puts higher demands on the flexibility of the new power system. Based on the traditional optimization scheduling model mainly based on hydrothermal power, and based on the energy structure and flexible resource characteristics of China, this paper constructs a multi-objective optimization scheduling model that takes into account the regulation characteristics of coal-fired units after flexibility transformation, the coupling relationship between ultra-high voltage direct current transmission capacity and coal-fired units start-up mode, and the regulation characteristics of new types of resources for hydrogen production. The effectiveness and feasibility of the model were verified using actual data from a provincial power grid. The verification results showed that the established model is conducive to exploring and utilizing various resource regulation capabilities such as source network load storage and transmission and improving the overall flexible regulation ability of the system.