Lead tube is usually used as the metal closure of Underground Cable. A large percentage of manholes are usually flooded, and some corrosive pollutants containing in the flooded manhole may corrode the metal cable closure and therefore cause severe problem in the telephone cable plant. In this study, the performance of organic coatings as well as the sacrificial anode for corrosion protection to lead tube are evaluated by the electrochemical impedance spectroscopy technique in an accelerated laboratory test. Zinc sacrificial anode is demonstrated to provide the lead tube an excellent corrosion protection from the strongly aggressive acid and solder flux. For the coating performance in the underground water, the rust inhibitor primer is superior to the epoxy coating.