The achieved results: The study has built a Vietnamese Words List for children under 6 years of age with practical significance in the evaluation of results for patients with cochlear implant after training: The study has built 3 sets of the Words List of Vietnamese monosyllabic Northern dialects for 3 ages of preschool children, each Words List includes 2 test lists of 50 single words, each test list has 25 test words with corresponding illustration image.