Abstract: To address the issues of low voltage quality, high network losses, and poor reliability associated with the long 10 kV lines in rural Heilongjiang, a feeder automation technology based on fiber optics and CAN bus is proposed. Initially, the limitations of conventional feeder methods are analyzed, and the design principles and implementation of the fiber optic + CAN bus technology are elaborated, focusing on real-time fault detection and rapid circuit breaker response. Furthermore, the mechanism for multi-point reactive power compensation is explained, demonstrating how it improves voltage quality and reduces line losses.Finally, case studies validate the effectiveness of this technology in practical applications. Results demonstrate that the technology effectively minimizes outage areas and durations while improving supply reliability, offering a novel approach for the automation of power system upgrades.