Abstract: The application of technology in language classrooms has become more commonplace in the last fifty years. Computer and the internet have made foreign language materials easy to access and use. We build on this growing body of research by presenting the findings of a research project that explored the effect of computer assisted language learning (CALL) on improving Iranian EFL learners‟ task-based listening as a motivating device to enhance formation of positive attitudes. The participants in this quantitative study included 40 EFL learners of English as a foreign language (EFL) at Islamic Azad University – Tabriz Branch. They were taking the two-credit conversation course 2 and formed two intact classes which were randomly assigned as the experimental and the control groups. During the CALL-based treatment each participant in the experimental group had an access to a computer in the English lab. They also received extra task-based listening comprehension materials and activities along with some comprehension questions three times a week through their e-mails. The data analysis of the post-test listening comprehension scores indicated a significant difference between the experimental and control groups; that is to say, the experimental group outperformed the control group and obtained a higher average. The motivation of the experimental group participants was also higher than the control group participants.