The main technical contents include thermal transfer film appearance quality, transfer layer printing quality and performance, safety requirements and other requirements and corresponding test methods: (1) Appearance quality includes the number of joints, film flatness, film roll end face and tube core Items such as misalignment, film roll tightness and color difference. (2) The printing quality and performance of the transfer layer include graphic unit size tolerance, overprint error, detachability, surface adhesion, clarity, friction resistance, sweat resistance and antibacterial properties. (3) Safety requirements include items such as the content of migrating elements and the content of phthalate plasticizers in the thermal transfer film.