Information technology infrastructure library (ITIL) is the most popular framework for it service management all around the world, problems for organizations in the process of adoption would eliminate its benefits. in fact the ability of organization to adopt this framework is the basis for it service improvement. few studies have tried to find out success factor the influence ITIL adoption but no study was found investigating an adoption model for this framework. in this study, first seven success factors were identified through qualitative meta-synthesis relying on previous studies; then, a research model based on the technology acceptance model (TAM) for representing the influence of these critical success factors on ITIL adoption is proposed. the success factor used are: (1) top management support, (2) communication and cooperation, (3) training and competence of involved stakeholder in ITIL project, (4) change management and organizational culture, (5) project management and governance, (6) ITIL process implementation and applied technology, (7) monitoring and evaluation