The hot compression test of SiCp/8%TiB2 aluminum matrix composites was performed by using thermal simulation tests in a Gleeble-3500 simulator. The thermal compression was tested at temperature of 350, 400, 450, 500 ℃ and strain rate of 0.001, 0.01, 0.1, 1 s-1 to investigate the behavior of high temperature flow stress. The constitutive equations of strain rate and flow stress of SiCp/8%TiB2 aluminum matrix composites were established, and the sinusoidal hyperbolic Arrhenius equation was used to explain the flow stress behavior. A processing diagram based on dynamic material model (DMM) was established to explain the hot workability of SiCp/8%TiB2 aluminum matrix composites. The microstructure analysis was carried out by scanning electron microscopy to verify the reliability of the hot processed image. The results showed that the deformation activation energy was 263.967 kJ/mol, the optimum processing conditions for the SiCp/8%TiB2 aluminum matrix composites were at the deformation temperature range of 490~500 ℃ and the strain rate range of 0.001~0.030 s-1 with the power dissipation efficiency reached the peak of 23%.