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Hot-dip galvanizing dual phase steel DP600 steel grade with low Si was produced by steel plant and experiments by simulating galvanizing thermal history.The microstructure was observed and analyzed by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The effect of different annealing temperatures on the microstructure and mechanical properties of dual-phase steel was also discussed.The experimental results show that the dual-phase steel possesses excellent strength and elongation that match EN10346 600MPa standards.The microstructure is ferrite and martensite.TEM micrograph shows that white ferrite with black martensite islands inlay with a diameter of around 1um and the content of 14 18%.The volume will expand and phase changing take the form of shear transformation when ferrite converted to martensite.So there are high density dislocations in ferrite crystalline grain near martensite.The martensite content growing will be obvious along with annealing temperature going up.But the tendency will be weak when temperature high.