Abstract: The saturable reactor of large component converter valve plays an important role, but some kinds of reactor are complex in structure with many branch water pipes and branch cables, which are prone to failure. In this paper, according to fault analysis on the vibration wear of the metal water-pipe, and compared with the reactors of other technical routes, it is assumed that design of reactor is unreasonable, resulting in the contact abrasion between cables and water pipes; then, the solution of rewiring, reducing the redundant length and replacing the damping resistance is put forward. The results of performance tests and live running tests show that the improved reactor has good performance and could solve the problem of water leakage caused by vibration of the metal water pipes.