There are several studies using 30ml volumes of transcerviacl Foley balloon catherter for labor induction with the advantages of this method, compared with pharmacological methods, may include efficacy, safety and low cost. Objectives: The purpose of this study was to determine the effectiveness and safety of transcervical Foley catheter balloon inflated with 30ml sterile saline for induction of labor pregnant  34 week oligohydramnios. Study design: we carried out a non - controlled clinical trial.