HIFU (High Intensity Focused Ultrasound) owns the non-invasive and focused penetrating advantage. By HIFU technology, it can use the non-invasive way (without surgery or injection) to act on designated subcutaneous area. Use high energy ultrasound focusing the treatment position, so that the skin tissue create the thermal and make high-speed friction cells to stimulate collagen. Such heat effect will not hurt the epidermis, because the treatment fast and direct access to the treatment site within 0-0.5 seconds, without touching the surrounding tissue and can be passed directly to the superficial tendon membrane system (SMAS), so it can be done firm skin while pulling the muscle layer, thin face up to the progressive effect.