Abstract: In the background of achieving the goal of“carbon emission peak and carbon neutrality”and promoting the construction of the new power system with renewable energy as the main part, high proportion of renewable energy connected to the grid and high proportion of power electronics equipment will become the main trends and outstanding features of the new power system in the future. This paper starts with an overview of the characteristics of the new power system, and summarizes the urgent needs of the new power system for modeling and simulation technology, introduces the current status and improving schemes of modeling and simulation technologies for the power system in terms of modeling optimization methods, multi-time scale simulation methods and simulation calculation methods, and the simulation new technologies and new application modes for the new power system are described. Finally, the simulation modeling technology and its application mode are prospected to better adapt to the construction and operation of the new power system. In the future, due to the continuous improvement of calculation technologies and simulation computing power, revolutionary may emerge in the simulation technology and application mode of the power system breakthrough.