Application for nano iron powders: 1. Nanometer iron as a nutrient with a miniaturized size, surface area and other characteristics, which brought lumps do not have the volume effect, surface effect, quantum size effect, it has excellent physical, chemical performance. 2. Nano-iron surface activity, more easily absorbed by the body, is currently in medicine, health care products, has been developed to strengthen the moderate iron food applications. 3. Nanometer iron powder as a carrier in combination with anti-tumor substances, magnetic field, can effectively control the distribution of vectors in vivo, targeted delivery of chemotherapy drugs to achieve the purpose by the tumor area is located.