Abstract: Several common wireless signal coverage schemes were analyzed to solve the problem of weak field coverage of vehicle to ground communication weak field solution for wireless shunting cab signal and monitoring system. Used low noise amplification technology, narrowband filtering technology, photoelectric conversion technology, radio frequency shift technology, combined with the actual conditions of the station, the frequency shifted fiber repeater was developed to extend the coverage of wireless signal, and applied to several stations. The analysis of the communication records of the vehicle in use shows that there is no interruption of vehicle to ground communication within 30 days, which satisfies the performance requirements of vehicle to ground communication for wireless shunting cab signal and the monitoring system. The construction of frequency shifted fiber repeater can solve the problem of the weak field coverage of the communication between the cab signal and the monitoring system, and improve the communication quality of the system.