In order to improve the safe operation level of cross-over lines, this paper took a 220kV cross-over line as the research object, and used the linear filtering method to simulate the pulsating wind speed time-history curve under high wind conditions and normal working conditions, and dynamics the finite element model of cross-over lines. Analyze and calculate, then focused on the comparative analysis of the stress state of the hardware, found the vulnerable position, and propose corresponding improvement measures. The results show that the stress at the joint of the hanging ball head loop is the largest. The ratio of the stress to the allowable stress under the two working conditions is 0.35 and 0.44, respectively, which is consistent with the measured fracture position in the field. It needs to be paid attention to; the joint of the rod is thickened and the safety factor is increased from 1.5 to 1.6, which can effectively reduce the risk of damage to the hardware.