Objective To explore the digital tomosynthesis(DTS)technology application value in children with atlanto-axial joint subluxation inspection.Methods 30 children with torticollis after injury,head and neck activities obstacles or local pain were selected.The consent of patient and family was obtained.At the same time the atlanto-axial joint open mouth,cervical lateral radiographies and DTS scanning were performed,two imaging quality and the diagnosis were compared.Results In all 30 cases,excellent imaging rate was 90% (27/30)on DTS and 53% (1 6/30)on DR respectively.On DTS atlanto-axial sublution were found in 22 cases but on DR atlanto-axial sublution were diagnosed in only 12 cases,suspicious subluxation in 4 cases,and misdiagnosis in 6 cases.Conclusion For diagnosis of atlanto-axial joint subluxation in children,DTS can obtain high quality images,clearly display anatomic structures and pathological morphology of atlanto-axial joint.