The effect of LiNbO3 electrode with three different configurations o n domain broadening by using poling method appling external electric field applying exter nal electric field is studied. The effect of poling electrode configuration in d omain broadening is studied. The experiment demonstrated that under the same pol ing condition, the broadening velocities are 0.089μm/ms and 0.011μm/ms when th e angle between the poling electrode and the diagonals of hexagonal domain nucl eus are 90°and 0°，respectively, therefore the circumstance of 90°angle betwe en poling electrode and the diagonals of hexagonal domain nucleus should be avoi ded in fabricating one-dimension nonlinear photonic crystal.