To investigate a convenient and effective treatment for congenital dacryocystitis and the timing of probing lacrimal passage. METHODS:Totally 52 cases (65 eyes) were collected in our study and classified into 3 groups according to their ages. Lacrimal passage flushing was done for each case by using a disposable sterile flushing needle under topical anesthesia, then the lacrimal passage was probed using the same needle directly. RESULTS:Thirty eyes (94%) were cured by probing the lacrimal passage once in the 1-3 months group which included 27 cases (32 eyes). 16 eyes (80%) were cured by probing once in the 4-6 months group which included 13 cases (20 eyes). The cure rate in the 7-11 months group by probing the lacrimal passage once was 46%. CONCLUSION:Lacrimal passage probing by a disposable sterile flushing needle is an effective, safe and convenient method for treating infantile dacryocystitis.