Abstract: Most charging pile cables adopt polyether-type thermoplastic polyurethane (TPU) sheaths. Focusing on common surface quality problems of TPU sheaths, influencing factors were analyzed by combining material characteristics and extrusion mechanism of TPU sheaths, and relevant solutions to typical quality problems were also proposed and verified in practice. Results showed that TPU was highly sensitive to extrusion temperature, extrusion pressure and shear rate, TPU extrusion can be significantly reduced after optimization, which could provide theoretical basis and practical guidance for the application of TPU in charging pile cables.