Abstract: An axisymmetric rigid-plastic and coupled thermo-mechanical FEM model of SiC_P/2024Al composite (volume fraction of SiC_P12%) for plat die hot extrusion process was established based on the software MSC. Marc. The model was used to simulate the hot extrusion process of the material. The pressure-stroke curves and flow lines were analyzed and the effects of temperature of billet and extrusion velocity were discussed. The result sindicate that bars without surface defects can be obtained smoothly under the condition of the extrusion ratio 30∶1，temperature 400～450℃，extrusion rate 0.1～1.0 mm/s and extrusion pressure 4.0 ×10⁶～5. 0 ×10⁶N. The quality bars were got following the same process on 700 t hydraulic press to prove the feasibility of this process.