Heavily cold rolled iron was examined with the EBSP-OIM system installed on the finely developed high resolution scanning electron microscope in the present work. Alpha fiber or <011>//RD structures were successfully observed demonstrating the crystallographic construction of heavily strained substructures at the interiors of the grains. The series of alpha fiber, i. e. {100}<011> - {211}<011> - {111}<011>, is recognised as smoothly deformed structures achieved with the dual-slips of {211}<111>, {110}<111>, etc. during the cold rolling. Taylor factor analysis tells the necessary amount of the slip for the each orientation in alpha fiber, as {100}<011> is the lightest and {111}<011> is heavier. When Taylor deformation is hard, non-Taylor deformations may easily be introduced, such as the slips with specific single systems which ought to be appearing as band structures where the strain is locally concentrated at the grain interior. The present study observed {211}<111> preferential slip creating heterogeneously deformed band structures in 90% cold rolled iron. The slip variants seemed to be selected for having the highest Schmid factor, therefore the active slip systems changed depending on the orientation of each alpha fiber grain. For example, near-{100}<011> grains possesses a mono band structure, on the other hand crossing dual band structures were observed in near-{100}<011> grains, which might be attributed to so called fish-born-structure, resulting in highly strained structure.