Suzhou Rail Transit has operated 3 lines. After entering the networked operation stage，the passenger flow has increased sharply，the scale effect of rail transit is obvious，the relationship with the society is closer and the interaction is stronger. The number of professional system facilities and devices are also increasing，and the degree of correlation between systems is greatly improved. Analyze the functional characteristics and management challenges of the medium-sized network，and propose an enterprise management model that matches the functional characteristics of the medium-sized network. Through innovative management mechanisms，culture leading development，emphasis on network planning and design，strengthening operational equipment security management and promoting intelligent elements to meet the needs of medium-sized network operations.