How to manage local area network (LAN) scientifically and effectively is an important question in remote control area. Remote control to the computers in LAN could relieve the network administrators of some of trivial works and improve the efficiency. This paper introduces the design and implementation of an intelligent, real-time controlling management system which has already been deployed in real use and proves high effect in practice. Based on socket network communication and API programming, the key control functions of network communication, remote screenshots, mouse and keyboard locking, screen-darkening, open and shut down computers are all realized in this remote-control system. Trojan horse technology is involved. The system is developed by Delphi 6.0 and has already been applied in many areas and produced high effect in practice.