Based on the model of static airgap permeance of the double-stator high temperature superconducting machine (DSHTSM) with the stationary seal, the influence of damper coils on magnetic field is analyzed by using the analytical method and the finite element method. The inner airgap magnetic flux density is deduced according to the path of the armature magnetic field. Then, the equivalent electric circuit model of damper coils is built and the alternating harmonic induced near the superconducting coils is derived, which is then verified by finite element simulation. The results show that the squirrelcage damper coils can effectively weaken the negative influence of the fundamental harmonic of the armature reaction field on the superconducting coils and the excitation field of DSHTSM is basically uninfluenced.