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The solution treatment of three different components of Fe-Mn-Al-Si light steel after cold rolling are carried out at 1050℃ and the time is 1h,30min,10min.The microstructure and mechanical properties of steel is investigated by using optical microscopy,drawing machine,XRD and SEM.Results shows that with the increasing of heat treatment time,the tensile strength of No.1 and No.2 reduces and the elongation of No.1 and No.2 firstly increases after an initial decrease; the tensile strength and elongation of No.3 decreases with the heat treatment time increasing.The microstructure of three different components of steels are always austenite + ferrite and the content of retained austenite increases with the heat treatment time increasing.There is no phase transformation and Transformation Induced Plasticity occurs during the deformation of the tested steel.