Introduction The 500 kV GIL pipeline of a project has the characteristics of a large single span and a high distance to ground. It is necessary to verify the seismic performance of gas-insulated metal-enclosed transmission lines （GIL）.
Method A three-dimension finite element model of GIL pipeline physical structure was established to perform a seismic response analysis.
Result The mode shape characteristics of the structure were obtained through modal analysis. The seismic performance of the GIL under different seismic excitations was then specifically evaluated by using the response spectrum analysis method.
Conclusion The 500 kV GIL transmission pipeline structure has a certain safety factor under the earthquake with a seismic intensity of 7 degrees.
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