Shape memory nickel titanium flat wire is a smart material made mainly of nickel and titanium. It has remarkable shape memory effect and super elasticity. After it is deformed, under certain temperature conditions, it can remember its original shape and restore it to its original state. In addition, it has good corrosion resistance and biocompatibility. It is often used in minimally invasive surgery, dental orthodontics and other medical fields, and also plays a role in precise control and flexible connection in some precision instruments and intelligent devices.