Nano-targeting technology is a modern advanced technology with a special function, using nanomaterials as a carrier to target treatment. Conventional nanomaterials are very tiny and are generally divided into biological targeting, physicochemical targeting and composite targeting. Biological targeting is the carrier of particles of 100nm or less into the bone marrow and accumulate in the bone marrow, the particles of 100-300nm accumulate in solid tumors and can play a good therapeutic role, and the particles of 0.3-3μm can be engulfed and taken up by the macrophages in the body. Depending on the site of uptake, nanomaterials accumulate in different parts of the body and play a certain therapeutic role in the body.