The purpose of the study was to evaluate the balance and postural control in children 15 years old with type 1 diabetes . all of children participated in this study have ten years chronicity of diabetes. Thirty children shared in this study assumed two equal groups, fifteen were normal children (GI) and fifteen were children with type 1 diabetes (GII), Assessment was done by Biodex balance system via the dynamic balance test which including anteroposterior, mediolatoral and overall stability index.Their age was 15 years. Their body mass index between 14-18 kg/m2. The dynamic balance parameters(Anterior posterior, Mediolateral and Overall stability indices) measured by Biodex Balance System at stability level 7. Comparing between the mean values of participant’s stability indices (OA,AP and ML) at stability level-7within the same group (A or B),there was no statistical significant difference (P> 0.05),But there was statistical significant difference between both groups(A&B)(P< 0.05) It could be concluded that there is decrease in balance parameters including (OA , AP and ML indices) at seven levels of stability during the dynamic balance test in children 15 years old with type 1 diabetes group compared with normal children.