OBJECTIVE: The aim of this study was to investigate the prevalence of spinal deformities such as scoliosis, thoracic kyphosis and lumbar lordosis in Korean elementary school students. METHOD: Five hundred forty Korean elementary school students were preliminary screened for spinal deformities by physical examinations and the three dimensional skeletal analysis system. The study time and pain regions were investigated in sitting on chairs that commonly used in Korean elementary school. RESULTS: The prevalence of scoliosis, thoracic kyphosis and lumbar lordosis were 9.8%, 18.7% and 23.1%. There was a significant difference in study time between spinal deformity group and control group (p<0.01). In spinal deformity group, pain regions were low back (45%), posterior neck (23%), buttock (21%) and shoulder and elbow joints (11%). CONCLUSION: The spinal deformities showed high prevalence in elementary school students assessed by the three dimensional skeletal system analyser. The long term follow-up evaluation and confirmative radiographic study will be necessary to assess curve progression in spinal deformity group.