Abstract: Being asynchronously interconnected with the other power grids, the southwest power grid shows the structural characteristics of high proportion of hydropower with the prominent problem of power grid frequency stability and the persistant risks of frequency oscillation. In order to ensure the safety and stability of a large power grid, it is increasingly important and urgent to build an overall solution for frequency oscillation suppression suitable for engineering applications. This paper summarizes the main frequency oscillation events at home and abroad, expounds the inducing mechanism of such events, and concludes the overall solution of the frequency oscillation suppression in the Southwest Power Grid based on engineering practices. It also discusses some development directions of frequency oscillation suppression technology, providing a reference for the development of new frequency stability control technology.