Low fever after arterial catheterization can be relieved by physical cooling, antipyretic and analgesic and anti-infection treatment. 1. Physical hypothermia: low fever after intervention may be a symptom of necrotic absorption fever, so physical hypothermia can be carried out first, such as wet compresses, warm water baths, and so on. 2. Antipyretic and analgesic: low fever after arterial catheterization can be treated with antipyretic and analgesic therapy to avoid endocarditis and other complications, and acetaminophen tablets, ibuprofen extended-release capsules, and other medications can be used under the guidance of a doctor. 3. Anti-infection: If the surgical site is infected, cefepime, ceftazidime and other cephalosporins can be used for intravenous drip according to the bacterial species. If the patient’s symptoms cannot be relieved or there are signs of aggravation, the patient should consult a doctor in time and be treated according to the doctor’s instructions.