Lately, one of the biggest challenges in enterprise is the strategic alignment of information technology with business. Enterprises use various methods to achieve this strategic alignment. Enterprise architecture is an effective approach that allows optimal management of Enterprise’s information technology and strategic alignment of IT functionalities and business requirements. These days, considering dynamic environments, there is the possibility of any kind of change in enterprise’s conditions, especially after implementation of Enterprise architecture. This change of conditions demonstrates itself in a variety of forms. In these cases, decision making should be done as an appropriate response to these changes which should be predictable. Otherwise it would lead to lack of proper response and consequently, readjustment of Enterprise architecture document, which imposes many human and financial costs on the enterprise. In addition, the enterprise’s progress toward competitive advantages will be stopped. The appropriate response and adaptability to these changes is a concept represented under the title of adaptive maintenance of Enterprise architecture. In the following article with the help of a software maintenance method and examining the possibility of extending into the Enterprise architecture maintenance, through a case study on Power Distribution Company of Golestan province, it is shown how the improvement of adaptive maintenance of Enterprise architecture can be assisted and the possibility of implementation of various types of changes in business and information technology without disturbing the Enterprise is provided. Manuscript profile