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The aim of this study was the investigation of sagittal curves of spinal column (Thoracic kyphosis and lumbar lordosis) in healthy boys with age between 12 to 17 years old. Thoracic kyphosis and the lumbar lordosis were evaluated in healthy boys by a flexible ruler with the child standing in a relaxed position. The sagittal curves were studied in 636 healthy boys between consecutive age-groups (12-13-14-15-16-17 ages) with a flexible ruler-a non-invasive device-with the child standing in a relaxed position. The accuracy and the reliability of this technique are studied and shown to be acceptable. Results revealed that the thoracic kyphosis and lumbar lordosis varied in deferent age-groups. The least pronounced kyphosis was seen at the age of 12 years and the least pronounced lodosis was seen at the age of 14 year. Analyses of variance (ANOVA) revealed significant differences between age groups in thoracic kyphosis (F (630)= 6.54, P= 0.001), but there was no significant differences between age groups in lumbar lordosis (F (630)= 0.960, P= 0.442). It was concluded that the mean range of kyphosis increase with increase of the age between 12-17 years in boys and we can use from finding of this study as the norm of thoracic kyphosis and lumbar lordosis.