Studying on mechanism of corona discharge excitation, a finite element model of Rain-wind vibration is established based on the finite element theory and the Newmark algorithm. Taking LGJ-240 as an example, experimental and numerial analysis are used to research the corona discharge ion wind generation and response, the corona wind power under load transient response and harmonic response characteristics. The results show that the role of corona discharge affected on vibration is remarkable. In additional, the ionic wind coupled with the wind force amplifies amplitude. Analytical methods and conclusions can be taken as references in designing UHV cable, upgrading of existing line and controlling vibration, especially in Rain wind region of southern china.