High performance fibers with high modulus and high strength have been reported to exhibit poor compressional properties. The present work is concerned with the axial compressional behavior of liquid crystalline wholly aromatic copolyester (ACPE) fiber (Ekonol type). ACPE fibers were embedded in 2-hydroxypropyl methacrylate and were compressed manually with a vise. Compressed ACPE fibers taken out from the resin block were examined by polarizing optical microscopy (POM) and scanning electron microscopy. In the initial stage of compression, kink bands are formed on the surface of ACPE fibers at an angle of ca 60° to the fiber axis. It was confirmed by POM that all molecular chains within the band were sharply bent from their original direction by an angle of 30-40°. It can be predicted that two slip systems, (110) ⟨001⟩ and (100) ⟨001⟩, are responsible for the formation of the kink band. With progressive compression, new kink bands were formed near the kink bands that were formed in the initial stage of the compression, indicating that compressional stress is concentrated at regions near the kink bands. When compressed further, massive lateral displacement occurred from place to place along fiber axis and finally ACPE fiber was almost squeezed out of shape. Intermicrofibrillar slip played an important role at this stage of compression.