Molybdenum is widely used in the production of various steel materials such as stainless steel. Because of its excellent thermal conductivity and high temperature resistance, molybdenum alloys have broad application prospects in aerospace, machinery, metallurgy and other fields. However, due to low-temperature brittleness, low strength, poor ductility and other deficiencies of molybdenum, it is difficult to deep-process molybdenum alloys, and its application is greatly restricted. For many years, my country's molybdenum industry has mainly produced molybdenum primary products. Therefore, the development of molybdenum alloy materials with better performance and higher added value is of great significance to the development of my country's molybdenum industry. Starting from the actual needs of the project, Sun Jun’s research team went back to the difficulties of material preparation technology, and revealed the characteristics and mechanism of the size effect of the strengthening and toughening of grains and intragranular and grain boundary particles in rare-earth oxide-doped molybdenum alloys, and established the strength and toughness Chemical quantitative analysis model, and proposed a new idea of ​​nano-doping strengthening and toughening. On this basis, researchers have developed a molecular-level doped liquid phase mixing to prepare the key technology of nano-rare earth oxide-containing molybdenum alloys, which solves the nanoization and non-agglomeration of rare-earth oxides, in the interior and grain boundaries of molybdenum grains. The uniform dispersion distribution and the high temperature stability of the nano ultrafine crystal structure are three key issues that restrict the development of this field. The strength, ductility and toughness of the molybdenum alloys they prepared exceeded the best levels of similar materials reported by world-class companies. At the same time, the plastic-brittle transition temperature was significantly reduced, and the alloy's high-temperature recrystallization temperature and high-temperature strength and tensile ductility were significantly improved. It is reported that related technologies have been applied on a large scale in the industry, and the project also won the first prize of the 2012 Technology Invention Award of the Ministry of Education.