采用固体粉末法将硼和稀土元素渗入钢的表面，通过金相组织观察，ｘ射线结构分析和渗层显微硬度测定，研究了稀土对钢的渗硼过程、渗层组织和性能的影响。结果表明，稀土对钢的渗硼过程有明显的活化催渗作用；稀土元素的加入量对催渗作用有一最佳量，在渗硼过程中稀土元素也同时渗入钢中和Ｆｅ＿２Ｂ相中，由于稀土元素的同时渗入，使渗层组织基本上由Ｆｅ＿２Ｂ单相组成，从而改善了组织，提高了显微硬度。 Boron and rare earth elements were infiltrated into the surface of steel by solid powder method. The effects of rare earth on boronizing process, microstructure and properties of steel were studied by microstructure observation, X-ray structure analysis and determination of microhardness. The results show that rare earth has a significant activation and permeability effect on the steel infiltration process. The addition of rare earth elements has the best effect on the infiltration, and rare earth elements infiltrated into the steel and Fe_2B phase during the boronizing process. The infiltration of rare earth elements at the same time, so that the basic composition of the infiltrated layer consisting of Fe 2 B single phase, thereby improving the organization and improve the microhardness.