On the basis of configuration of side-polished poled fiber, a model of six-layer waveguide with double metal layers is put forwavd to describe the poled fiber and analyze the propagation characteristics of lightwave in the poled fibers. The analysis indicated that the lightwave propagating in the poled fiber has characteristics of polarization extinction due to the existence of metal electrodes deposited on the flat of the optical fiber. The main parameters of the device that affects the propagation characteristics of poled fiber are the distance between the core and polished flat, and the thickness of insulator adjacent to the anode.