The main difference between ordinary carbon dioxide laser and ultra-pulsed carbon dioxide laser lies in the different output modes and different treatment effects. The ordinary carbon dioxide laser generally has only two output modes, i.e. continuous output and pulse output. Due to the existence of rated power of the laser, its power limitation can change the burning state of the skin to the carbonized state, which can cause greater thermal damage, in which case it is more likely to cause damage to the tissues around the target, and it is more likely to form hyperpigmentation after improper post-treatment care. The output light pulse width of the super pulsed CO₂ laser is extremely short and the power is extremely high. The natural heat dissipation of the skin is generally 1~2 milliseconds, and the pulse width of the ultra-pulsed CO₂ laser is less than 2 milliseconds, which can reduce the scope and degree of thermal damage of the tissues around the target cells in this heat dissipation interval, and also shorten the recovery time after the treatment by stimulating the proliferation of collagen and tightening of the skin in the long term with double curative effect. Patients who are willing to be treated are recommended to go to a regular medical institution, under the guidance of a professional physician to choose the appropriate program for treatment according to medical advice and personal needs, and pay attention to scientific care and strict sun protection after treatment.