Abstract: The proportion of clean energy such as new energy and hydropower in the new power system increases continuously. The frequency beyond the limit brought by high proportion of new energy and the ultra-low frequency oscillation risk caused by high proportion of hydropower are becoming increasingly prominent. In order to support the research needs of frequency safety and stability analysis and control under different scenarios of the new power system, this paper constructs the frequency stability benchmark test system (The Chinese Society for Electrical Engineering- frequency stability, CSEE-FS). For the traditional frequency stability problem, high-frequency and low-frequency scenarios with new energy installation and output ratios both above 50% are constructed to analyze the influence of disturbance intensity, new energy output and control strategy on the maximum frequency deviation and its corresponding occurrence time as well as steady-state frequency deviation. For the ultra-low frequency oscillation problem, a scenario with hydropower output ratio reaching 89% is constructed to analyze the influence of different AC/DC disturbance types, key parameters of governor and system inertia on oscillation frequency and amplitude. The sensitivity analysis results show that the benchmark test system constructed in this paper can accurately reflect the characteristics of different frequency stability scenarios and has respectable scalability, which can meet the verification needs of frequency safety and stability analysis and control methodologies for new power systems.