This paper is particularly directed at the current 3G TD-SCDMA mobile communications network con-struction demand.It analyzes the differences between 3G-SCDMA network and the GSM network dis-tribution system

and points out the main issues that focused on the current indoor coverage technology of the 3G network construction.It also introduces the Wireless Fiber Distribution System WFDS which is particularly applicable to the 3G network coverage construction.