Gas insulation switcher(GIS) is important equipment in power system. It plays an important role in the power transmission, and is of great significance to the safe and stable operation of the power system. The method of detecting mechanical faults using sweeping frequency characteristics of power equipment has attracted wide attention, but there is few research about the magnetic field and electromagnetic force distribution of the GIS under sweeping frequency currents. In order to solve above problems, finite element model of 110 kV three-phase common type GIS is established. And the distribution characteristics of the magnetic field and electromagnetic force of the GIS under different current frequencies are simulated. The results show that with the change of current frequency, the distribution of magnetic field in the GIS and the distribution of the electromagnetic force on the GIS shell and the conductive rod do not change. However, the magnitude of magnetic field in the GIS and the magnitude of electromagnetic force on the GIS shell change with the current frequency change. Research results provide foundation for detecting mechanical faults by using frequency sweeping characteristics of the GIS.