Scarring is the result of abnormal repair of skin tissue trauma. In recent years fractional laser has been widely used in scar treatment. Current research has shown that fractional laser is able to promote drug transport in the expression of cytokines such as target histone leukase and transforming growth factor beta, basic fibroblast growth factor, to achieve the effect of scar treatment. The fractional laser has excellent results in scar removal, as each pulse of the laser is divided into nearly 100 micro laser pulses, which can be used to vaporize and decompose the scar structure with high precision. The parts of the skin that are not affected by the laser will accumulate more collagen and elastin, helping to regenerate and rearrange the collagen in the dermis. Fractional laser is widely used in clinical practice, not only can it treat many kinds of scars, such as acne scars, trauma scars, post-operative scars, frostbite scars, etc. Some scars that are not suitable for excision can also be treated with fractional laser. Patients should find a regular institution, find a professional doctor, and develop a reasonable and effective treatment plan, and they will surely have a good treatment effect.