Recurrent oral ulcers in children are a group of unexplained, recurrent but self-limiting oral mucosal lesions. Most of them are relieved by general treatment and medication. 1. General treatment: use compound chlorhexidine gargle to gargle, irradiate the ulcers with laser, visible light or microwave therapeutic instrument, which can reduce the exudation and promote the healing effect. Give vitamin C and vitamin B complex tablets and other vitamin preparations to improve the body’s self-healing ability. 2. Drug therapy: when secondary bacterial infection can be oral amoxicillin, cefixime, cefaclor and other drugs anti-infective treatment; for zinc deficiency of children can follow the doctor’s instructions oral zinc sulfate syrup and so on. All of the above drugs need to be used under the guidance of a doctor, avoid self-medication. Children mouth ulcers may also be the oral manifestations of other diseases, it is recommended to consult a doctor in a timely manner, by a specialist to determine the assessment, in order to avoid delays in the condition.