BACKGROUND: Rosacea is a chronic cutaneous vascular-neurological disease. Its basic pathological change is the dilatation of local capillaries. It severely affects facial aesthetics because it is located in the central part of the face. Topical topical and oral medications can significantly improve the symptoms, such as metronidazole, azelaic acid, peroxynivalenol, tetracyclines, isotretinoin, and vitamin C. However, many patients require further improvement of the treatment effect, which is the fingerprint of laser treatment. The treatment of vascular diseases is mainly performed with long pulsed lasers, while the use of a large spot increases the depth of treatment and allows the destruction of larger diameter vessels. Intense pulsed light (IPL) can significantly improve the erythema, capillary dilation and papules caused by rosacea. Treatment parameters: pulse width 2.5-5ms, multi-pulse treatment (2-4 pulses), pulse delay time 20-30ms, 530nm filter, energy 10-30J/cm2. for patients with capillary dilation combined with acne, 420nm filter, energy 10-20J/cm2. spot size 10mm×40mm. one treatment session every 1-3 weeks Before treatment and 1-3 weeks after treatment, a Reveal Imager was used to record and analyze. In addition, the treatment parameters should be adjusted according to the patient’s skin type during the first treatment. For patients with skin types 1-5, the first treatment energy should not exceed 25,21,17,13,10 J/cm2. Subsequent treatments should be adjusted by 1 J/cm2 each time according to the last treatment effect, safety and patient tolerance. RESULTS: The majority of patients showed significant improvement in symptoms. There were no adverse effects such as edema and erythema. DISCUSSION: The 520 nm filter is better able to treat superficial skin capillary dilation than higher wavelength filters such as 560 nm, and therefore treats erythema better. The use of 420 nm filters is able to improve acne-like rashes by destroying superficial skin lipid glands through photothermal action. Dividing the light energy into 2-4 pulses for irradiation with a certain pulse delay interval can reduce the chance of surrounding skin damage and pigmentation. CONCLUSION: IPL (pulse width 2.5-5 ms, 2-4 pulses, pulse delay time 20-30 ms, 530/420 nm filter, energy 10-30 J/cm2) can safely and effectively treat various types of rosacea. To mitigate adverse effects, treatment parameters should be individualized according to the patient’s skin type, severity and tolerance to treatment.