With the vigorous development of China high-speed railway construction after the sixth china railway speed—up campaign

the coverage of the GSM and TD-LTE communication network is faced with new challenges when the speed of the train exceeds to 200km/h

the traditional mobile communication network could not fulfill all the requirements. Therefore

it is essential to improve network quality

and enhance the user perception. This paper introduces the characteristic of high-speed coverage environment and problem

such as doppler shift

penetration loss

signal fading

fast and frequent handover

etc. Analyzes the site assigment and investigation of the private networks that cover high-speed railways

including link budget

handoff overlapped region

multi-site cell

etc. The practical test results of Nanning–Guangzhou high-speed railway verify the feasibility and effectiveness of the proposed solution.