Teaching-learning processes in the e-Iearning context are identified as procedures that facilitate learning, using a variety of learning services based on a technology platform. This process is analysed with a focus on the teacher's different presences in online position or e-Iearning environment, specially their presence in cognition, communication and teaches. Given this notion of how the process of teaching learning facilitates learning in a virtual learning environment and what the relationship is between the different roles a teacher might take on, the paper is designed on the basis of the researcher's approach to the teaching-learning process, teacher roles and the implications of mentioned roles in the three virtual Universities selected from Iran.