Problems left over after the opening of the domestic subway network, the focus of the facilities and systems into a new line rectification According to statistics, as of now, the subway is a total of 200 of the new line focus rectification project. The subway construction sector revealed that they carried out several rounds of a new line of multi-level defects rectification check hidden investigation of security incidents, rail line area security checks, major holiday before the holiday check, eliminating a traffic safety hazard. Continuous lightning failure occurred rectification ago, through the point of investigation and analysis of the short-circuit fault arrester cable found defective construction process. The subway construction sector Subsequently insulation heat shrinkable tube reinforcement, increased insulation strength, while changing the cable installation, increased insulation distance measures to improve the reliability of equipment operation.