Abstract: ［Objective］ Severe abnormal wear of PC (pantograph-catenary) systems can lead to the breakage of contact wires and the collapse of the overhead network, directly causing power supply interruptions and potentially triggering traffic accidents. Therefore, it is essential to analyze this issue and develop effective solutions. ［Method］ Based on a thorough analysis of Guangzhou Metro Line 3,various measures are adopted, including monitoring tunnel temperature and humidity, inspecting the surface conditions of carbon strips and contact wires, increasing maintenance frequency, enhancing thermal sliding operations, and conducting specialized grinding work. The impact of significant temperature drops and dry conditions during winter on PC wear is explored and corresponding special maintenance strategies are proposed. ［Result & Conclusion］ Targeting the complicated phenomenon of PC abnormal wear, Guangzhou Metro identifies temperature drops, humidity, and surface profile matching of contact components as key factors influencing abnormal wear through in-depth analysis. The implemented optimization measures significantly improve the PC interaction, and provide an effective approach to addressing abnormal wear in rigid catenary systems encountered by many Chinese cities, achieving remarkable results.