Abstract: The multijunction waveguide array antenna is one of the key components for plasma heating and current drive on EAST superconducting Tokamak device, and its structure performance determines the plasma current heating and drive efficiency. When the plasma current rupture, the eddy currents are induced in the antenna because of the plasma current decay in a short period. These induced currents interact with the strong static magnetic field to produce forces and torques in the antenna, which will damage the structure of the antenna. Electromagnetic analysis of 4.6 GHz Lower Hybrid Wave (LHW) antenna in EAST is investigated. The forces and torques of LHW antenna are performed using the finite element method. Then the electromagnetic stresses and displacements due to electromagnetic loads are also calculated. The simulation results offer guidance for the design and manufacture of the antenna.