Since mobile communication has been well developed, the high quantity services is also expected by mobile users, the repeater which is a kind of useful radio signal transmission and enlarging facility is widely used to extend and cover the mobile communication blind area and to enlarge the base station signal. As it is low investment, low running cost, relatively short building period and good network quality, and thus Effective utilization of repeater will be very beneficial and obtain high award. However, in reality, repeaters more or less disturb the capabilities of themselves and other equipments, due to people do not combine theory with practice properly and systematically.This paper is researched the key technique of CDMA wireless wideband repeater Base on engineering application, put forward the design scheme of CDMA wireless wideband repeater. Analyzed and calculated the important index of system, implemented the hardware of main control system and software design. The result shows that the design accords with standard of our country and industry and technique guideline announced by factory. Finally, the key problems existing in engineering application analyzed of CDMA wireless wideband repeater is discussed and corresponding measure are proposed.