Disconnections in the basal-prismatic (BP) interfaces of twin have been investigated by many computer simulations. In this paper, we report experimentally that the disconnection in the BP interface of twin in deformed titanium can be observed by high-resolution TEM (HRTEM). This disconnection can be characterized as using a coherent dichromatic complex. Correspondingly, the migration process of the basal-prismatic plane resulting from glide is described.