This paper presents an account of our observation on characters of the α-LiIO3 by using a plorazation microscope. The conduction of crystal,the deposition and distribution of the space charges were studied for eight crystal specimens under the actions of the DC electric field in c-direction with five different electrode interface states. The colored quasi-straight bright lines were observed that formed through the transport of the space electric charges of α-LiIO3.There are a correspondence relation between it and the diffraction band of the photo-refractive grating in the crystals, and the different interface states have exerted obvious influence on the ionic transport and crystal conduction in α-LiIO3.