In the past 20 years, with the rapid development of laser medicine, various laser treatment methods for hemangioma have emerged, which have become the common methods for treating some skin hemangiomas due to their remarkable efficacy and small side effects. 1.Vivid nevus, also called wine-like nevus, is a kind of congenital vascular malformation, formed by the expansion of capillaries in the dermal papillary layer, with an incidence of about 0.3% in newborns, varying in size with age and ranging from pink to purple in color, and early treatment is desirable. Commonly used lasers are as follows: 1.1 Pulsed dye laser (Vbeam): Vbeam is a pulsed dye laser system designed according to the theory of selective photothermal action, treating children under 1 year of age with bright red nevus, after 4 treatments, 63% of the lesions are cleared by more than 75%. It has a higher cure rate and lower incidence of scarring and pigmentation than the 585nm pulsed dye laser used in the past, and is one of the best lasers for treatment effect at present. 1.2 Frequency doubling Nd:YAG laser: Nd:YAG laser (wavelength 1064nm) can produce green laser of 532nm with frequency doubling and wavelength halving after passing through KTP crystal. 532nm laser is near the absorption peak of oxyhemoglobin and has high selectivity for treatment, with adjustable pulse width from 2 to 100ms. 532nm laser has poor penetrating power and is suitable for superficial Vascular damage, for deeper sites of vascular disease efficacy is poor. 1.3 Long pulse Nd:YAG laser: wavelength 1064nm, pulse width 0.25~500ms, can penetrate deeper skin tissues and has the ability to coagulate deeper tissues, this instrument also has the characteristics of pulsed laser, avoiding the disadvantage of continuous laser easy to leave scar. Therefore, it has better efficacy for hypertrophic nevus and capillary dilation with thicker vascular diameter. 1.4 Intense pulsed light (IPL): for vascular lesions with smaller and shallower vessel diameters treated with shorter wavelengths (570nm filter) and smaller pulse widths, it has better results. 1.5 Photodynamic therapy (PDT): the principle is that when the photosensitizer is injected into the blood vessels, it can be rapidly absorbed by the vascular endothelial cells selectively and concentrated, and the absorption of photosensitizer by the vascular endothelial cells is much higher than that of the dermal extravascular mesenchymal and epidermal cells, at this time, the patient is given an appropriate dose of specific wavelength laser irradiation, and the vascular endothelial cells there can produce a strong photosensitization reaction due to the absorption of more photosensitizer, which generates reactive oxygen species and causes vascular PDT has a highly selective destructive effect on the superficial capillary network of the dermis, with high clinical efficacy and low side effects. Strawberry hemangioma is a kind of benign vascular endothelial cell proliferation, the incidence rate is close to 10% around 1 year old, usually occurs in the head and neck, and its natural process is divided into two stages: proliferation phase (mainly within the first 7 months of life), receding phase (the lesions gradually disappear, part of the remaining capillary atrophy and fibrous tissue proliferation), complications include ulceration, important organ infarction, bleeding, etc. Laser treatment can prevent the development of strawberry hemangioma. Laser treatment can prevent the above complications, reduce the psychological burden of children and parents, and early intervention can also prevent the enlargement of hemangioma and reduce the risk of fibrous tissue proliferation. 2.1 For superficial strawberry hemangioma with lesion thickness less than 3mm, Vbeam and intense pulsed light can be used to achieve ideal results. The most effective treatment period is the proliferative period with an interval of 2-3 weeks, and the receding period with an interval of 1-2 months. 2.2 For strawberry hemangioma with lesion thickness greater than 3~10mm, long pulse Nd:YAG laser should be used. The thickness penetrated by this laser reaches 5~10mm, so the treatment of deep hemangioma is more effective. 3.Cavernous hemangioma is classified as a venous type of low-flow vascular malformation, which often develops to deeper tissues. For cavernous hemangioma with small area, few traffic branches and superficial purplish-red lesions, continuous Nd:YAG laser is used to irradiate the tumor directly, which is most suitable for mucosal lesions; for cavernous hemangioma with larger area and more traffic branches, Nd:YAG laser light guide fiber can be inserted into the tissues through the guide needle to perform inter-tissue sector or zoning irradiation, which generates high heat due to full absorption of laser energy by hemoglobin and red blood cells during irradiation. For cavernous hemangioma with wide area and infiltration in important organs and vascular nerves, surgical flap treatment combined with Nd:YAG laser can be applied, which has the advantages of small trauma, less bleeding, precise efficacy, high selectivity to lesion tissue and no functional disorder after surgery. 4.Arteriovenous malformation, which is called trapezoid hemangioma or arteriovenous fistula in the past, is a high-flowing vascular malformation, and the expanded reflux veins can be seen in ultrasound and other imaging examinations. Laser treatment is almost ineffective, and in recent years, percutaneous puncture transcatheter intracavernous selective arterial embolization has been increasingly widely recognized as the treatment of choice for arteriovenous malformations. In summary, there are many classifications of hemangiomas and vascular malformations, and the pathogenesis is not fully understood. Although some hemangiomas can degenerate on their own, hemangiomas born in the face, genitalia, oral cavity and fast-growing hemangiomas are better treated early, and blindly waiting for self-healing can affect the physical and mental health of the affected children. Therefore, the principle of treatment for children with hemangioma is to treat them as early as possible and to choose the right period.