Abstract: Taking the H13 hot-extruded mandrel as the research object, the ABAQUS FEM simulation software is used to set up relevant model to simulate the work process of the hot-extruded mandrel so as to achieve related calculated results like the hot extrusion force, the sectional temperature field and the Mises stress field, etc. The accuracy of the said model is verified by comparing the extrusion force as simulation calculated with that as actually measured. The surface toughness, the hardness and metallographic examination of the H13 extruded mandrel with two different sizes are tested, and the test results get the reliability of the simulation calculated results proved. Based on the FE simulation calculation, the fatigue life of the mandrel is predicted. Furthermore the effects on the fatigue lives by the non-coating material, the α-Al₂O₃-coated material and the ZrO₂-coated material are compared, which shows that the service life of the ZrO₂-coated material is the longest, then that of the α-Al₂O₃-coated one, and the that of the non-coated one has the shortest service life. Application of applicable coating technique will get the mandrel service span obviously improved.