GIS-M1000 SF6 insulated equipment on-line monitoring system is mainly used forenvironmental monitoring online and GIS switch room, the SF6 circuit breaker GIS.The system uses the sensor technology and computer technology, high accuracy of measurement, data can be remote, convenient installation and use, is suitable forvarious voltage levels from different manufacturers of SF6 circuit breaker and GIS,to meet the need of automation and equipment condition maintenance of powerdistribution network. This system is an important technical equipment indispensableto realize the power distribution automation electrical equipment on-line monitoring and condition based maintenance.