Purpose The purpose of this study was to investigate the effects of cervical stabilization on postural alignment and balance in patient with stroke. Methods The study was designed in ABA format with a single subject design. The study was conducted on men diagnosed with a 52-year-old stroke, and after 30 minutes of cervical stabilization training in supine and sitting, 20 minutes of functional movement exercise were conducted with cervical stabilization orthosis, 50 minutes a day, 5 times a week for two weeks. Craniovertebral Angle(CVA), Functional Reach Test(FRT), Modified Functional Reach Test(MFRT), Timed Up and Go test(TUG) and collected information every time. Results As a result of the study, the CVA, FRT, MFRT showed significant changes in both baseline and regression period after intervention. There was no significant change in the total time of the TUG, but the sit to stand time increased and the walking speed increased. Conclusion This study demonstrates that cervical stabilization training has shown significant improvements in posture alignment and balance in stroke patient.