With the rapid development of high speed railway

the 2nd and 3rd generation networks no longer meet the user’s requirement in high speed scenario.The communication quality and network capacity have become the bottleneck of performance for high speed railway communication system.This work discusses the architecture of high speed railway communication system based on TD-LTE backhaul system

analyzes its feasibility

and focuses on the research of detailed mapping strategy of air interface bearer for the limited air interface resources.