Insulators play an important role in electric multiple unit（EMU）insulation equipment

uneven potential distributions and excessive electric field may cause partial discharge

therefore

it is significant to research the electric field distribution and the influencing factors. In this paper

a three-dimensional electric field model is established with Ansys to calculate and analyze the electric field of the EMU high voltage disconnector insulators according to its real structure and working conditions. The results show that the high electric field intensity concentrates on high voltage end

along with the leakage distance increasing

the falling speed tends to decrease and the differences of circumferential potential and electric field also decrease. The EMU dome has little influence on potential and electric field. The effect of high voltage disconnecting switch on potential and electric field are mainly 0° direction for No.1 insulator and 180° for No.2 insulator takes second place. The high voltage disconnecting guide exerts a little impact on the potential and electric field of No.1 insulator

while having clear influence on the potential and electric field of No.2 insulator. The simulation results can be used as the basis to simplify the simulation model and reduce the electric field intensity of the insulator high voltage end.