Abstract: LTE (long-term evolution) technology can better meet the needs of urban rail transit FAO (fully automatic operation) system. High-capacity wireless data transmission system is required in FAO depot application library. When the bandwidth resources of the RRU (remote radio unit) cell are limited, capacity can be expanded by adding RRU cells. The network deployment scheme of LTE system under different conditions of FAO depot is introduced. It is suggested that in the early stage of the application library design, the upper limit of LTE system capacity and the necessity of physical separation in the middle of the application library should be considered. In the case of fully considering application library train concurrent data transmission requirements, bandwidth resource conditions and LTE capacity upper limit, by increasing the number of RRU cells and setting up physical separation in the application library, the cochannel interference can be greatly reduced, and the data transmission rate can be close to the theoretical peak value, and the capacity demand of data transmission can be met in the case of limited bandwidth resources.