Crystal structure analysis of cylindrical phase of polystyrene-b-polyethylenebutylene-b-polystyrene triblock polymer was carried out. One cylinder with radius 74.20 Angstrom passes through a hexagonal unit cell with a = b = 294.42 Angstrom, c = infinity, beta = 120degrees. The temperature factor which reflects the disorder of the cylinder is 14.525 and (1/2) is estimated as 13.56 Angstrom. This suggests that the cylinder is distorted and the surface of the cylinder is disordered. (C) 2004 Elsevier Ltd. All rights reserved.