Objective To investigate the operation time and safety of lacrimal passage probing under the basal anesthesia for congenital nasolacrimal duct obstruction.Methods 1018 cases (1070 eyes) with congenital nasolacrimal duct obstruction aged 6 months to 18 months were treated by lacrimal passage probing in our hospital and the data of them were respectively analyzed.All the cases were divided into three groups according to age:6 months to 8 months,9 months to 12 months,and 13 months to 18 months.The outpatients underwent conventional probing of lacrimal passage,and inpatients underwent lacrimal passage probing under basal anesthesia.The efficacy and complications of the surgery were analyzed.Results After following up for 3 months,the efficacy of lacrimal passage probing in 3 groups were 96.98％ (386 eyes in 398 eyes,95.93％ (283 eyes in 295 eyes),and 96.02％ (362 eyes in 377 eyes) respectively,there was no statistically significant difference among three groups (P ＞ 0.05).The effective rate of local anesthesia group was 96.00％ (528/550) and the effective rate of basic anesthesia group was 96.73％ (503/520).Between the two groups there was no statistically significant difference (x2 =0.4064,P =0.5238),but in 13 months to 18 months group,the effective rate of basal anesthesia was higher than that of local anesthesia and the difference was statistically significant (x2 =4.457,P =0.0348).Complications:The incidence rate of complications in local anesthesia group and basic anesthesia group was 11.09％ and 2.31％ respectively,and there was statistically significant difference between two groups (x2 =32.437,P ＜ 0.0001).Conclusion Lacrimal passage probing under the basal anesthesia is easy to perform and less complications.and it has high curative rate for children over 12 months.