The finite element simulation of the hot extrusion process for the Mg2B2O5w/AZ63 Bunder different processes was carried out by using DEFORM-3Dsoftware.The effects of the varied extrusion temperatures（250 ℃

300 ℃

350 ℃）and speeds（1mm/s

4mm/s）as well as extrusion ratio（6.25

14

20.25）on equivalent stress of the extruded composites were analyzed.The simulation results reveal that temperature has significant role in equivalent stress

and the maximum equivalent stresses are decreased from 185 MPa to 135 MPa when the extrusion temperature is increased from 250℃to 350℃.In addition

the maximum equivalent stresses are decreased from 184 MPa to 167 MPa when the extrusion speed is increased from 1mm/s to 4mm/s at fixed ratio and temperature.With the increase of the extrusion ratio

the equivalent stresses of the billet in the extrusion chamber are increased and the extrusion billet in the die taper angle suffers a strong extrusion and shearing deformation.Therefore

the grains sizes are refined and the distribution of the equivalent stresses becomes more uniform.