Abstract: Objective: To analyze the correlation between preoperative cervical sagittal parameters and prognosis in patients with degenerative cervical myelopathy (DCM).Methods: A total of 102 patients with DCM who underwent laminoplasty in the Department of Spinal Surgery at Enshi Central Hospital from January 2017 to May 2020 were selected.C2-C7 lordosis (CL), C2-C7 sagittal vertical axis (CSVA), T1 slope (TS), difference between TS and CL (TS-Cl), modified Odom's criteria, modified Japanese Orthopaedic Association (mJOA) score, and visual analog scale (VAS) score were recorded before and one year after surgery.The recovery of DCM was evaluated by mJOA recovery rate.Results: Pearson correlation analysis showed that postoperative sagittal plane correction angle (CL change, △CL) was negatively correlated with preoperative CSVA, TS and TS-Cl (r=-0.266, r=-0.286, r=-0.258, P< 0.05).Multivariate logistics analysis showed that preoperative CL lordosis, CSVA ≥ 22mm and TS-CL ≥ 14.5 were risk factors for poor prognosis in DCM patients (P< 0.05).The area under receiver operating characteristic (ROC) curve (AUC) of preoperative CSVA and preoperative TS-CL for predicting poor prognosis in DCM patients were 0.720 (95% CI:0.620-0.819) and 0.699 (95% CI:0.586-0.812), respectively.The △CL, modified Odom's classification, VAS score improvement and mJOA score improvement were better in patients with CSVA< 22.45mm or TS-CL< 21.5° DCM (P< 0.005).Conclusion: Both CSVA and TS-CL before laminoplasty are effective cervical sagittal plane parameters for predicting postoperative CL changes and prognosis in DCM patients.