In order to study the distribution of disturbed electric field produced by a non-metallic cylindrical target under active electric field, the second electric dipole model of a non-metallic target in shallow water environment was established on the basis of the mirror method and the regional gridding method. By using the established model, the disturbed electric field at different positions near the target was calculated and was compared with the simulation results of boundary element method software. The results show that the error of the horizontal component of the disturbed electric field is less than 3%. Then an experiment was carried out in a water tank. The result data from test were basically consistent with the calculated results, which shows that the established secondary electric dipole model is accurate.