A new poly(3,4'-alkylbithiophene)-based anion exchange membrane win deigned and synthesized. A well-defined crystalline bilayer lamellae structure with ion channel was constructed by self-organization of the polymer and maintained even in a hydrated state because Of the semicrystalline nature of the materials. As a result, swelling of the membrane was effectively suppressed, and higher:anion conductivity was obtained compared with a control polymer without ion channel. The synthesized polymer is-a promising model system for further understanding of the relationship between solid-state structures and anion-conducting membrane properties.