Background: Diabetes, a metabolic disorder, has reached epidemic proportions in developed and developing countries. So, the Use of High-Definition Video Technology has gained acceptance as a tool for improving diabetes management. The aim of this study was to determine the effect of using High-definition video technology on diabetes management. Methods: Subjects: All 120 diabetic children, in the Diabetic center in the EL Mogamaa EL Teby AL Shamal, Menoufia Governorate, Egypt. Instruments: It consisted of four tools: 1) Questionnaire for socio demographic data; 2) Questionnaire for nutritional practices and practicing of exercise; 3) Observational checklists, guidelines for testing urine reagent strips for acetone or sugar, guidelines for Diabetic foot and nails care and guidelines Steps in Performing a capillary blood glucose test by using the home device; 4) Diabetic child's investigations' results (fasting blood glucose level, postprandial blood glucose level and glycosylated hemoglobin level) were collected from child's record. All tools were used for pre-post intervention. Results: The study showed a statistical significant reduction in fasting blood sugar, Post prandial blood sugar and glycosylated hemoglobin level of cases group after intervention (120.57 + 29.13, 165.57 + 29.13 and 7.08 + 1.56, respectively) compared with cases group before intervention (166.37 + 27.66, 232.80 + 57.02 and 9.61 + 1.94, respectively). Also, there was statistical significant improvement in care of feet and nails, blood glucose monitoring and nutritional practices of cases group after intervention (64.25 + 2.81, 36.35 + 2.44, and 10.88 + 1.45, respectively) compared with control group (23.21 + 1.37, 17.63 + 2.11, and 5.28 + 1.37, respectively). Conclusions: The implementation teaching-assisted High-Definition Video Technology has succeeded in achieving significant improvement in diabetic children' diabetes management practices skills. Recommendations: implementation of teaching-assisted High-definition video technology for all patients' health education fields.