Ferritic stainless steel is being paid attention by steel industry and downstream users relying on its good over-all properties and low cost.With improvement of metallurgical technology and researching on fundamental theory,further development is obtained in properties optimization and quality stabilization of modern ferritic stainless steel,its marked feature are super purification and Nb/Nb-Ti stabilization.Nowadays,modern ferritic stainless steel is used widely in auto industry,home appliances,solar water heater,construction and decoration fields.The paper focuses on the effect mechanism of Nb technology on modern ferritic stainless steel and summarizes its application progress in typical downstream industries in China.