Introduction & Objective: Cervical laminectomy is a well-known and standard procedure for the treatment of cervical myelopathy due to degenerative narrow cervical canal. There are many different reports about the incidence of post laminectomy kyphosis in the literature and the causes are not well understood. Materials & Methods: This study was done in a retrospective/prospective manner, reviewing the files of the patients operated by cervical laminectomy between1377-1387 and following them prospectively. The demographic data is presented. The cervical alignment in neutral and dynamic situations and pre/post operative neurological conditions will be compared. Results: In this study, the incidence of post laminectomy kyphosis was 11.9%, which was less than what was reported in other series. The decrease of cervical alignment was not significantly related with the degrees of preoperative cervical alignment, but the neurological improvement rate was correlated significantly with post laminectomy alignment. Cervical pain was correlated significantly with the increase of age, osteoporosis and cervical alignment. The incidence of kyphosis increased with more long term follow up. Conclusions: The incidence of post laminectomy kyphosis in the patients operated for degenerative narrow cervical canal is less than what happens in the patients undergoing laminectomy for other reasons (11.9%). The incidence of kyphosis increases with longer periods of follow up and is accompanied with lower rate of neurological improvement. Accordingly, these patients need longer periods of follow up.