AbstractOnline Public Access Catalogue (OPAC) is one of the services introduced along with library automation which is playing an important role in retrieving bibliographic details of publications in the library. The questionnaire based survey conducted at the library. 150 samples of the questionnaire is distributed randomly between the staff and students of Madurai Kamaraj University, Madurai, out of which 132 completed and valid questionnaires (88.00%) are received for analysis. The data received from the respondents through the questionnaires is analyzed. This paper examines the use and functional lapses in operation of OPAC in the academic libraries in Madurai and presented the results here. This provides original data from library end users in Madurai Kamaraj University experience whiles using OPAC.