Abstract: A miniature flat optical and electrical hybrid cables (hereinafter referred to as the electrical hybrid cables) for indoor deployment of 5G micro base station was introduced. The hybrid cables have the characteristics of small structure, light weight and low power consumption. The structure design, manufacturing process and die optimization of the electrical hybrid cables were described. Three different configuration technologies of sheath extrusion die were explored. The mechanical, environmental and electrical properties of the hybrid cables were tested, which met the requirements of 5G indoor signal deep coverage communication for micro base stations (such as picobase stations and femtobase stations, etc.) and had a wide application prospect.