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Traditional dual phase (DP) steel is a kind of typical multiphase steel, which is usually composed of ferrite and martensite/austenite (MA) phases.1) Hard granular MA islands and soft ferrite matrix are the characteristic microstructure of the traditional DP steel. The composite microstructure contributes to the good comprehensive mechanical properties, such as low yield strength, continuous yielding, good plasticity and good formability.2–4) By changing the shape and the ratio of ferrite and martensite/austenite phases in DP steel, both high strength and ultrahigh toughness can be obtained in the new kind of micro-laminated DP steel.5) The micro-laminated dual phase microstructure has close relationship with the formation of δ-ferrite and the extension of δ+γ dual phase region at high temperature due to the addition of aluminum.6,7) The microstructure and mechanical properties of this kind of steel were discussed in our previous work.5) An excellent combination of high strength and ultrahigh impact toughness was obtained in this kind of steel. However, the effects of hot rolling process on the microstructure and mechanical properties are still not researched systematically. In this study, the microstructure and the mechanical properties of the micro-laminated dual phase steels were examined to understand the influence of hot-rolling parameters. Both the hot-rolling temperature and reduction have great effect on the ultrahigh impact toughness of the rolling Effect of Hot-rolling Parameters on the Microstructure and Property of Fe–Mn–Al–C Micro–laminated Dual Phase Steels