Usability of digital library is considered to be an important phase of any digital library projects . This research paper is framed in the evaluation of Alwaraq’s digital library which is available on the Internet at http://www.alwaraq.net. Based on related studies, a set of fourteen items covering efficiency, effectiveness, visual appearance, and learnability have been developed to evaluate the Alwaraq’s digital library interface. Twenty seven undergraduate students from the department of library and information science at the University of Benghazi participated in completing the Likert scales questionnaire. The main finding of the study indicated that Alwaraq’s digital library level of usability was not up to the standard, in particular regarding visual appearance and efficiency.