The hot deformation and dynamic recrystallization (DRX) behavior of 15%SiC particle reinforced aluminum matrix composites were studied through isothermal compression test at the temperature of 713-773 K and the strain rate of 0.001-1 s-1; the hot deformation constitutive equation was established. Meanwhile, DRX grain size of the composites was measured by a Quantiment-500 automatic image analyzer. In the study, q–s and ?q/?s–s curves were plotted based on the experimental data to further obtain the critical strain and steady strain of DRX. Then the critical strain model and the steady strain model of DRX were set up by regression analysis of experimental data. Based on the results, the diagram of DRX for SiC particle reinforced aluminum matrix composites was given.