(1) Clinical manifestations: unilateral or bilateral onset, but unilateral is more common; recurrent parotid swelling, swelling episodes are mostly related to eating. After pressing the parotid gland, some salty liquid is felt to flow out from the duct opening, followed by a feeling of relief; clinical examination of the parotid gland is mildly swollen, slightly tough, with redness and swelling at the mouth of the parotid duct, and cloudy liquid flows out from the duct opening when the gland is pressed; sometimes striated ducts can be palpated in the cheek. (2) Routine examination: Parotid gland imaging is routinely performed. In chronic obstructive parotitis, parotid imaging shows partial narrowing and dilatation of the parotid dominant duct, interlobular and interlobular ducts, with salami-like changes. Treatment: 1. Maintain oral hygiene and rinse the mouth with a gargle during attacks. 2. Massage the gland daily to promote saliva discharge, and local physiotherapy is also feasible. In the acute stage, antibiotics are given to the whole body and antibiotic solution can be used to flush the parotid ducts to control the inflammation as early as possible. 4.Duct perfusion treatment The use of 40% iodized oil on the affected side during the intermittent period has been clinically proven to be a good treatment method. Since iodized oil has a strong bactericidal effect by dilating the duct system, and iodized oil is a highly viscous liquid with poor mobility and insoluble in water, it is not absorbed and discharged slowly after being injected into the ducts. The catheter infusion therapy can achieve the best mechanical flushing and effective antibacterial effect with the maximum concentration of drug in the parotid area, which is an effective method for treating chronic obstructive parotitis.