It does not matter which one is better, the protein thread or ultrasonic knife, because the usage and purpose of the two are different. Clinically, protein threads are absorbable threads, which are generally used after surgery, especially for cosmetic suturing of skin incisions, because absorbable threads can generally be absorbed by themselves after 3 months, eliminating the pain of removing the threads. At the same time, because absorbable threads are used for intradermal suturing, it avoids the conventional use of silk sutures, which leave centipede feet after removal of the sutures, and the incisions are more beautiful. Ultrasonic knife is generally used in clinical practice for laparoscopic surgery or open surgery because of its powerful coagulation, hemostasis and separation and cutting effects, and the surgical wound is very clean, with a clear field of view and a clear tissue level for anatomical exposure.