The human spine is in the sagittal plane, the cervical spine and the lumbar spine have a lordotic curve, which is cunter-balanced by thoracic kypotic curv., These curves provide optimal biomechanical anchoring to the numerous muscle groups. These curves allow optimal load transfer along the spine and abdominal cavity. Any significant change in these curves structurally alters the stress transfer across the vertebral units, potentially subjecting them to injury, which invariably leads to pain. The purpose of the study was to find out the proportion of low back pain among the school children. Having the mechanical problem associated with low back pain among the school children by using school desk assess the psychological factors associated with low back pain among the study subject and assess the others factors associated with low back pain among the study subject. In this cross-sectional study a total of 136 school children (male 59, 43.4%; female 77, 56.6%), mean age 13.18 years, duration of the work near about six months were obtained from different area of Dhaka city. A total 136 school children included in the study among them 68.4% have low back pain and 31.6% did not have low back pain. Significant factors are physical activities, mode of transport and duration sedenty activity.