Abstract: This article introduced the Digital Wireless Communication System for railway public security based on DMR digital cluster communication technology, focused on the key technologies such as system structure, system function, frequency allocation, handoff mechanism, and vehicle configuration. The DMR technology used in the system could effectively improve the spectrum utilization rate, saved the precious frequency resources, and implemented the high quality long distance communication. This System could meet the needs of high quality voice communication, support data transmission, be powerful for data communication function.