The purpose of this study was to identify the dimensions and competency components of teacher assistants in electronic learning context. It was an applied research with exploratory qualitativeMethodology. The statistical population of the study was specialist assistants with experience in the e-learning environment. To achieve the goal of research, the theoretical and empirical literature of the research were studied. The data were collected, using a semi-structured interview method with 22 experts in the subject area, and analyzed using content analysis method. Based on the results of the research, the competency model of the assistants in four dimensions was as follows: professional-professional competencies (educational, research, subject knowledge, class management), interpersonal communication competencies (teamwork and interactivity), competencies related to information and communication technology (thinking Information and communication technology, ICT knowledge, ICT skills )and general and individual competencies (perceptual, creativity, innovation, ethics and behavior )were identified and designed.