System Integration, English system integration, refers to the integration of equipment and information in an organization, which supports applications through a complete system. System integration includes equipment system integration and application system integration. Equipment system integration can also be called hardware system integration, and in most cases it is simply called system integration or weak current system integration, which is different from strong current integration of electromechanical equipment installation. It refers to the integrated design, installation and debugging, customized interface development and application support of related equipment and software by using integrated wiring technology, building automation technology, communication technology, network interconnection technology, multimedia application technology, security technology and network security technology. Equipment system integration can be divided into intelligent building system integration, computer network system integration and security system integration. Intelligent building system integration: English intelligent building system integration refers to the integrated design, installation and debugging, customized interface development and application support of related equipment and software by using integrated wiring technology, building automation technology, communication technology, network interconnection technology, multimedia application technology and security protection technology for the purpose of building an intelligent building management system in the main building. The integrated implementation subsystem of intelligent building system includes integrated wiring, building automation, telephone exchange, computer room engineering, monitoring system, burglar alarm, public broadcasting, access control system, building intercom, smart card, parking management, fire protection system, multimedia display system and remote conference system. The intelligent building system integration of multiple residential buildings with similar functions and unified management is also called intelligent community system integration. Computer network system integration: English computer network system integration refers to the integration of scattered devices (such as personal computers), functions and information into interconnected, unified and coordinated systems through structured integrated wiring system and computer network technology, so that resources can be fully enjoyed and centralized, efficient and convenient management can be realized. System integration should adopt various integration technologies such as function integration, network integration and software interface integration. The key of system integration is to solve the interconnection problem between systems. It is a multi-vendor, multi-protocol and application-oriented architecture. This needs to solve various integration-oriented problems involving subsystems, building environment, construction coordination, organization and management, staffing and so on, such as interfaces, protocols, system platforms, application software and so on. Security system integration: English security system integration refers to the integrated design, installation and debugging, customized interface development and application support of related equipment and software by using integrated wiring technology, communication technology, network interconnection technology, multimedia application technology, security technology and network security technology for the purpose of building a security management platform within an organization. The integrated security system subsystem includes access control system, building intercom system, monitoring system, anti-theft alarm, all-in-one card, parking management, fire control system, multimedia display system and remote conference system. Security system integration can be used as an independent system integration project, and can also be included in the intelligent building system integration as a subsystem. Application System Integration, English application system integration, provides the system mode of application for customers' needs from the height of the system, as well as the specific technical scheme and operation scheme to realize the system mode, that is, provides users with comprehensive system solutions. Application system integration has penetrated into the specific business and application level of users. In most cases, application system integration is also called industry information solution integration. Application system integration can be said to be the advanced stage of system integration, and independent application software vendors will become the core.