Cervical sagittal balance (CSB) represent the cervical region in normal position support the 7 cervical bone by strong muscle maintain the neck in normal angle and give more flexible to move in flexion an extension and any deformity or pathological change effect the disc lead to more symptoms and restrict of movement and effect on quality of life.this work is aimed to study the effect of restoration of cervical sagittal balance post anterior cervical discectomy and fusion (ACDF) in one level on patient's functional and clinical outcome.Cohort study between 2019-2020 for 30 cases for effect of restoration of cervical sagittal balance post ACDF surgery for degenerative cervical disc in one level using the cervical sagittal parameter to predict and evaluate the amount of lordosis to find out the clinical outcomes. We used the imaging parameters and the functional outcome scores, including the visual analog scale (VAS) and neck disability index (NDI) to provide valuable clinical informations regarding the restoration of CSB in patients treated with single-level ACDF. The procedure was pre and post parameters of CSB and aim of restoration of all parameter and functional outcome without additional complications.In our study, mean age of patients were 44.53±7.61 and regard sex distribution male represent 53.3% and female 46.7%. Level of lesion was distributed as (C3-C4) and (C4-C5) represent 20%,and (C5-C6) and (C6-C7) represent 30% in all cases. Regards change assessment between pre and post-operative, C2-C7angle angle significantly decreased from pre and post with 15% change, and C1-C2 angle angle significantly increased from pre and post with 7% change. There was no significant correlation at postoperative except between VAS and NDI.Maintain the cervical sagittal balance in normal angel post the ACDF procedure gives a significant improvement in the function of the patient post-operatively. The most important cervical sagittal balance is the thelordotic upper angle in restoring the patient active life is recommended. The cornerstone to achieve longterm and excellent results postoperative is to correct the sagittal balance.