The otitis externa is still not cured after half a year, it may be related to chronic diffuse otitis externa or or otitis externa fungal disease, we need to choose the symptomatic and causative treatment according to the type of disease and symptomatic features. 1. Chronic diffuse otitis externa: purulent otitis media long-term pus stimulation is the cause. It is easy to develop when the skin of the external auditory canal is traumatized or the local resistance is lowered. Diabetic patients and allergic body is prone to recurrent attacks. Can be coated with tretinoin acetate urea cream, remove secretions or scabs before use, systemic supplemented with vitamin A treatment; active treatment of infected foci such as suppurative otitis media; to strengthen the diagnosis and treatment of certain systemic diseases such as anemia, vitamin deficiencies, endocrine disorders and diabetes mellitus. 2. Fungal otitis externa: there are many kinds of fungi that cause this disease, and Aspergillus, Penicillium and Candida are more common. When the external auditory canal into the water or accumulation of secretions, long-term use of antibiotic liquid ear drops, etc., more susceptible to fungal infection. Treatment is feasible to remove the granulation, necrotic tissue pus, with 1% to 3% salicylic acid ethanol solution or 1% to 2% muscimol ethanol solution coated ear. It can also be used to spray mycotoxin on the external ear canal or apply imidazole broad-spectrum antimycobacterial drugs. Choose sensitive antifungal drugs according to fungal culture results. Keep the external auditory canal as dry as possible. Systemic application of antifungal drugs is usually not needed. When otitis externa has not improved for half a year, you can actively consult a doctor for a systematic examination to clarify the diagnosis and cause of the disease, and then follow the medical standardized treatment.