Abstract: The overheat fault of gas insulated switch-gear (GIS) disconnector contacts severely damages the reliable operation of equipment. In order to monitor the temperature rise and the overheat fault of GIS disconnector contacts, this paper establishes a 3D numerical coupled multi-physics model of eddy current-fluid-temperature of GIS with contacts. The resistance of contactor is replaced by a conductor with variable resistivity, and the current density and power loss of GIS disconnector are calculated through analyzing the electromagnetic field. The temperature of conductor and tank are calculated by using the finite element model whose heat source is power loss. The inversion law and influence factors of the temperature rise of GIS disconnector contacts are studied based on the coupled multi-physics model. The results show that the relationship between the contact of phase A, B and the temperature rise of tank is 1∶0.215, and the relationship between the contact C and the temperature rise of tank is 1∶0.165. The research results can provide theoretical basis and technical support for monitoring the temperature rise of GIS.