Abstract: The changes of microstructure in the recovery and recrystallization processes of as-hot-rolled dual-phase steels after compressive deformation were observed by means of TEM.The effect of Si and degree of deformation on these processes were studied.As a result, silicon obviously delays the recovery and recrystallization processes of experimental steels. The processes of light deformed(30%) steels were later than that of seriously deformed (90)% steels. The activation energies were also calculated from HRC-hardness testing results.