· AIM:To analyze and investigate the clinical effects of recessive placement of spherical headed silicone tube through lacrimal passage in treatment of nasolacrimal duct obstruction.· METHODS:Totally 101 cases 122 eyes with nasolacrimal duct obstruction were treated by recessive placement of spherical headed silicone tube through lacrimal passage and followed up for 6-24 months.The effects were observed.· RESULTS:After surgery,105 eyes(86.1%)were cured,12 eyes(9.8%)showed progress and 5 eyes(4.1%)were ineffective.The total effective rate was 95.9%.· CONCLUSION:This operation is simple,safe,time-saving,without incision,less bleeding and has high successful rate,it does not change the original anatomical structure.·