Axial heat-transfer characteristics of gas insulated swithgear(GIS) cable terminals are important to the reliability and utilization of cable assets.The equivalent thermal circuit model is established, and its axial and radial heat-transfer characteristics are analyzed.A 110 kV GIS cable terminal high-current experimental platform is built, and a steady-state temperature rise experiment of 800 A to 1 200 A is performed to further analyze its characteristics.The results show that the axial heat transfer degree of GIS cable terminal is positively correlated with the load size.When the load is 1 200 A, the temperature to the high point is 93.0 ℃, and the maximum axial temperature difference is 15.4 ℃, exceeding the rated load capacity of the cable line.The analysis shows that the axial heat transfer of the GIS cable terminal is obvious, and the influence range is about 1 m behind the liner, and the conductor at the push spring section is the temperature to the high point.The influence weight of the ambient temperature on the GIS cable terminal and the cable body is the same and shows a linear rule.The research results can be used as a reference for power dispatching and operation and maintenance departments to evaluate the ampacity of cable lines.