Dacryocystitis mucous cysts or purulent cysts can communicate with the sieve sinus to form sieve sinus lacrimal fistula, when the secretion is discharged from the nasal cavity through the sieve sinus, the cysts can be reduced or even disappeared, and the symptoms can be alleviated, and there is the same effect as the nasal drainage surgery. 1, routine blood test Acute dacryocystitis when the routine blood test can clarify the degree and nature of infection. 2.Bacterial culture of lacrimal secretion and drug sensitivity test can clarify the nature of infection and the type of pathogenic bacteria, and provide important reference for drug treatment. 3.Pathological examination 4.CT examination When cysts are formed in chronic dacryocystitis, it shows round or round-like cystic watery density shadow, and the density of abscess is slightly higher than the density of water. Intensified scan has different degrees of circular enhancement. 5.Dacryocystography After flushing the tear duct and compressing the lacrimal sac, 20% iodine oil or 60% pantothenoglucosamine 1~2ml is injected into the lacrimal punctum, the residual contrast agent in the conjunctival sac is swabbed off, and the orbital front and side images are taken to observe the filling situation of the contrast agent.