Abstract: A "green electricity" molten salt energy storage system was proposed, and mechanism model analysis on the key components of the molten salt heat storage system was analyzed, so as to conduct the mathematical model identification experiment and analyze dynamic characteristics. Results show that the molten salt heat storage system generally exhibits the characteristic of large inertia. Through the design of multistage heating and heat exchange devices, the temperature, flow rate and pressure of molten salt and steam in the molten salt system can be effectively controlled, improving the quality of heating steam and ensuring the stability of the entire system, meeting the thermal and power generation needs.