The fine microstructures of medium and medium-high carbon bainitic steels were observed and analyzed by high resolution electron microscope (HREM). The investigation results show that there are retained austenitic films with different appearances and sizes in bainitic ferrite laths. The boundaries of different structure levels are separated and encircled by retained austenitic films. The fine structure units and their sizes of different structure levels in the bainitic ferrite were determined by retained austenitic films. The bainitic ferrite laths are composed of different structure level sublaths, subunits and elementary units (or so called sub-subunits). The dimensions of most sublaths, subunits and elementary units are 25-80 nm, 2580 nm and 5.0-30 nm, respectively.
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