Building intelligence involves a wide range of disciplines, including electrical, installation, decoration, weak current, computer, software and so on. It is also a marginal branch of the construction industry, which is often not favored by major design institutes. Most design institutes define building intelligence as electrical specialty, first-class builders define building intelligence as electromechanical engineering specialty, and some owners define building intelligence as IT or information specialty. The definitions of building intelligence are varied. The intelligent building, which is generally recognized by China's construction industry, is based on architecture, has both communication and office equipment automation, integrates system structure, service and management, and provides an efficient, comfortable, safe and convenient building environment. \ x0d \ x0d \ intelligent building is a developing concept, which is constantly updated and supplemented with the progress of science and technology and the changes of people's functional requirements. \ x0d \ x0d \ In the usual design, I divide building intelligence into three systems: security system, communication and control system and multimedia system. Each large-scale system contains many subsystems, which is slightly different from some design specifications. \ x0d \ x0d \ The purpose of building intelligence is to create a safe, convenient, comfortable, efficient, reasonable investment and low energy consumption living or working environment for users. Any facilities and systems set in the building must obey this goal, otherwise the building intelligence will lose its meaning. I wanted to find some words on the internet to perfunctory, but I didn't find the right one! I have been engaged in the field of building intelligence for less than 10 years, with limited ability and insufficient right to speak. Therefore, I hereby declare that my introduction only comes from my personal understanding, which may be somewhat inappropriate, please! ) \ x0d \ x0d \ 3A Building intelligent systems are divided into BAS, CAS and OAS, namely building control system, communication automation system and office automation system. \x0d\ Common systems are: \x0d\ 1, fire alarm system \x0d\2, closed-circuit monitoring system \x0d\3, parking lot management system \x0d\4, building automation system \x0d\5, background music and emergency broadcasting system \x0d\6, and integration. X0d\\x0d\9, wireless forwarding system and wireless intercom \x0d\ 10, audio-video system \ x0d \11,water and electricity meter cc system \ x0d \ x0d \ 12.