Abstract: The microstructure consisting of dispersed cementite particles and ferrite grains was obtained by quenching and tempering in low carbon steel. The effect of cementite particles on the dynamic recrystallization of ferrite in this low carbon steel was investigated by hot compression tests at 700℃ and 0.01 s^-1 on a Gleeble 1500 test machine. The results indicated that during hot deformation at 700℃ and 0.01 s^-1, the dynamic recrystallization of ferrite takes place mainly by particle stimulated nucleation. At the beginning stage, particle stimulated nucleation occurs firstly near coarser particles (larger than 1 μm). At larger strain, particle stimulated nucleation also occurs near relatively small particles (between 0.5 and 1μm) due to accumulative strain.