Objective:To find a new technique for determine sagittal screw angle(SSA)cervicothoracic spine (C6-T6) pedicle screw placement by measuring the angles between different anatomic landmarks and between planes of upper vertebral end-plate. Methods:CT images of 60 cases (thirty males and thirty females) of normal adult human cervicothoracic segments (C6-T6) were analyzed in thiss study,The angles between the plane of the upper vertebral end-plate and the line between the vertex of the spinous process and the upper one (method one); the lower one (method two); the superior margin line of spinous process (method three); the left vertebral laminae plane of the same spine (method four); the right vertebral laminae plane of the measuring same spine (method five)were measured ,respectively. One or several methods was be chosen as a new placement technique for cervicothoracic spine(C6-T6)pedicle screw surgery on SSA by the reference values of each method in C6-T6 and comparing the pros and cons of different methods. Results:The angles between the plane of the upper vertebral end-plate and the line between vertex of spinous proscess and adjacent ones were 100° to 110°with great deviation in C6 to C7,and from T1 to T6,the angles approached 90°with smaller deviation;the angles between the plane of the upper vertebral end-plate and the left vertebral laminae plane decreased gradually from C6 to T6. The vertebral laminae plane was 90° in the vertical position. Conclusion:If the angles of pedicle screw agianst the vertebral laminae plane are about 90° at C6 to T6,the sagittal srew surgery are 0°,the vertebral laminae plane can be the identification marker for cervicothoracic spine(C6-T6) pedicle screw surgery on SSA.