The invention relates to a GIS reserved spacing and GIS equipment. The reserved spacing arranged in the GIS equipment consists of a first bus, a second bus, a first disconnecting switch, a second disconnecting switch, a disconnecting switch for extension and an extended interface. The first bus is connected with one end of the first disconnecting switch by an electric conductor; the second bus is connected with one end of the second disconnecting switch by an electric conductor; the other end of the first disconnecting switch and the other end of the second disconnecting switch are connected with one end of the disconnecting switch for extension and the other end is connected with the extended interface. A main bus disconnecting switch is arranged between the main bus in live-line operation and the extended interface to carry out electrical isolation and the disconnecting switch for extension is also arranged to carry out electrical isolation. Therefore, work linking can be carried out under the circumstance that the main bus works normally without the need of complete power interruption control of the main bus, so that the large-scale power interruption is avoided; and thus a requirement of a non-power-interruption linking function of the reserved extension spacing in practical engineering can be met.