Different services are separated by independent train ground communication networks in existing urban rail transit systems. Most of the independent train ground communication system are using IEEE 802.11 based WLAN technologies, which has many drawbacks when used in urban rail transit system, such as high speed performance degradation, open free frequency, etc. In this paper, we design a train ground communication system for Integrated Service in urban rail transit/metro system using LTE technology (LTE-M). Dedicated frequency spectrum is used in the LTE-M based system. The real LTE-M based system is built on the ring rail line in Beijing to perform the field test. The performance of the integrated services including the CBTC, PIS, IMS and TOSM (Train Operation State Monitoring) are tested. Extensive test results show the advantages of LTE-M. The test results analysis also illustrates the disadvantages of using LTE-M in urban rail, and gives some advises for LTE-M based system design in engineering.