As the quality and height of buildings are getting better and better, the traffic density and coverage requirements are also rising constantly. These buildings are large in scale and good in quality, and have a strong shielding effect on mobile phone signals. On the underground floors of large buildings, underground shopping malls, underground parking lots and other environments, mobile communication signals are weak, and mobile phones can not be used normally, which forms a blind area and shadow area of mobile communication; on the middle floor, due to the overlapping of signals from different surrounding base stations, the ping-pong effect occurs, and mobile phones are frequently switched or the call drop may occur, which seriously affects the normal use of mobile phones. In the high-rise building, due to the height limitation of the base station antenna, it can't be covered normally, and it is also the blind area of mobile communication. In addition, in some buildings, although the mobile phone can be used normally, the user density is high, the channel of the base station is crowded, and it is difficult for the mobile phone to go online. Network coverage, capacity and quality are the key factors for operators to gain competitive advantage. Network coverage, capacity and quality fundamentally reflect the service level of mobile networks, and they are the themes of all mobile network optimization work. Indoor coverage system is produced under this background.