The structural system of electrical equipment connected with the hard tube can effectively solve the defor-mation caused by temperature variation

and also can reduce the dynamic coupling interaction between connecteddevices. Influence on the seismic performance of interconnected equipment is great by ways of sliding fittings

whichhas the characteristics of low cycle hysteresis and energy dissipation

or other connection mode to connect the hardtube. In this paper

we mainly researches on a high voltage DC field circuit system

the analysis method and the es-tablishment of the finite element model are briefly introduced

and the concrete steps of simulation analysis is put for-ward. By analyzing the stress

which is under seismic conditions of conventional seismic design

of the DC circuitsystem with different connection modes and checking the strength of the key parts

the influence of the connectionmodes on the dynamic characteristics and seismic performance of high voltage circuit system are comprehensivelystudied. Several useful conclusions are drawn

and the simulation results could provide reference for power engineer-ing and seismic strengthening design.