Abstract: In recent years, according to the modular construction requirements of State Grid Corporation of China,The power distribution building of semi-indoor and indoor substations usually adopts steel frame structure. Its roof is generally arranged in staggered layers due to the layout requirements for electrical equipment, the project adopts 220-A3-4 scheme, the lower roof layer is a large opening structure（weak torsional resistance）between the 2 ～ 7 axes and the A ～ B axes, while the load of incoming and outgoing lines is unevenly distributed on the X axis（letter axis） of the distribution building, so the X-aaxis horizontal inter story displacement ratio of the structure under seismic action is difficult to meet the code line. In this paper,the viscous damper is arranged according to the structural characteristic of the 110kV power distribution building in high intensity area. By selecting the appropriate performance parameters for viscous damper, seismic structural measures of the building can be reduced by one degree on the premise of meeting the provisions of the specification. Compared with the original design, it not only reduces the inter story displacement ratio,but also reduces the maximum inter story displacement.It is conductive to the safe operation of electrical equipment.Finally,the shock absorption design scheme simplified 50 tons of steel and 20.7 cubic meters of concrete.