In order to analyze the impact of the earthquake on the transmission line, the seismic case data is collected by the optical power grounded waveguide(OPGW) distributed optical sensor monitoring system, analyzes the characteristics of the vibration of the transmission line affected by the earthquake, and a preliminary attempt is made to evaluate the impact of earthquake on transmission lines based on the measured vibration data of the tower line system, which fully verifies the optical sensor monitoring system based on the OPGW can accurately monitor the seismic activity of the transmission line channel, and can sense the impact of the seismic wave on the entire line.