Abstract: Equipment quality is fundamental to ensuring the safety and stability of the power grid. Improving the level of grid equipment, advancing towards mid-to high-end equipment, and persistently enhancing the intrinsic safety level of the power grid are top priorities in current and future work. Only by ensuring the quality of grid equipment at the entry point, namely starting from procurement quality, can equipment quality be fundamentally improved. In recent years, State Grid Corporation has conducted verification of supplier qualifications and capabilities before tendering. By verifying and confirming information such as the qualifications, performance, and on-site actual production situation of suppliers, State Grid has gained preliminary insights into whether potential suppliers of power equipment have the qualifications and capabilities to produce qualified products. However, there are still cases of major equipment failures occurring during operation. Therefore, in order to effectively prevent and control technical risks of products, promote the transformation of power enterprises from scale expansion to quality and efficiency-oriented development, strengthen the whole-process quality control of the power grid, and improve equipment quality from the source, this paper first analyzes advanced experiences of domestic and foreign power enterprises, with a focus on understanding their supplier selection and management methods in the procurement process. Based on the actual situation of State Grid, a supplier selection mechanism based on PSO-ELM is established to drive the power grid equipment towards the mid-to high-end level and enhance the intrinsic safety and reliability of the power grid.