The frame foundation design for the air turbine generator of a 300 MW compressed air energy storage power plant's lacks reference projects and must meet stringent vibration control requirements. It is necessary to conduct natural vibration characteristics and dynamic response analysis to guide the engineering design. This paper investigates the natural vibration characteristics and forced vibration response of the air turbine generator frame foundation through numerical analysis

and examines the effects of various optimization measures on the dynamic responses of both the foundation slab and intermediate platform. The results indicate that the longitudinal displacement at the lowpressure cylinder location of the frame foundation is significant

approaching the limit specified. Increasing the crosssectional height of the slab beams and enhancing beam stiffness effectively reduce the longitudinal displacement of the foundation slab. Additionally

the vertical displacement of the intermediate platform reaches 20.46 μm; increasing the slab thickness and secondary beam height significantly reduces this displacement. The findings provide valuable references for the dynamic analysis and structural design of similar engineering foundations.