Scanning force microscopy (SFM) images of the surfaces of poly(ethylene oxide) (PEG) crystals revealed oriented fibril-like growth with increasing annealing temperature. Some clear nucleation centres on the melt-crystallized surface and typical lamellar morphologies with a step height of 11.7 +/- 0.5 nm were observed. Molecular folding structure (near four-fold symmetry structure with the nearest neighbour spacing of 7.4 Angstrom) was also imaged on the PEO single crystal with SFM. The spacings and angles of the periodic array in the molecular image were consistent with the positions of the top of the molecular chain folds on the PEO single crystal surface.