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 Hot working die steel needs good strength and toughness ratio, and impact toughness has always been an important reference index, and improving the impact toughness of materials has been the focus of this research. Domestic 4Cr5Mo2SiV steel is improved due to lower Si and 4Cr5MoSiV1 on the basis of the content of V, high performance heat to increase the content of Mo for die steel, because of its thermal fatigue cracking, good thermal shock cracking, thermal wear and plastic deformation performance, and has become the best choice of casting, forging, heat extrusion die steel. High performance heat is the same kind of imported steel, chromium molybdenum, vanadium steel, pure iron by adding pure smelting alloy elements necessary to, and all through the ESR process, so it has very high purity, but also has a very high wear resistance at high temperature and high temperature toughness and thermal high mutation it is suitable for the fabrication of complex structure, large precision casting die. To this end, some researchers have compared the microstructure and impact toughness of domestic 4Cr5Mo2SiV modified steel and imported similar steel, and analyzed the gap between domestic material quality control level and imported materials.