Based on the introduction of multiple lightning tripping accidents and the cause analysis of tripping for 110 kV Longgao 898 transmission lines, the fault point of C-phase arrester on the 35# large crossing tower over the Yangtze River is pointed out in this paper. The adjustment scheme of line lightning protection, which was to restore the overhead grounding wires, was put forward combined with the site situation. The results show that the transmission line after the adjustment run normally. Therefore, it is suggested that the arrester monitoring in transmission lines management should be strengthened.