Abstract: - The objective of this article is to evaluate the effectiveness and determine the relationship between the dimensions of the quality of service based on the components of the servqual scale and the structural equation model in the central library of Ferdowsi University of Mashhad from the perspective of graduate students. The present research method is in terms of the descriptive-survey method. The statistical population of the research includes all graduate students of Ferdowsi University of Mashhad. The sampling method is based on a stratified random method proportional to the size of the population. The data collection tool was the standard Serqual questionnaire. The validity of the questionnaire was approved by experts, and the reliability of the questionnaire was calculated using Cronbach\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'s alpha coefficient method equal to 0.91. To test hypothesis 1, the student\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'s t-test statistic (average test of a community) and to test hypothesis 2, the structural equation method and path analysis diagram were used to determine the relationship between variables. The effectiveness test of the service of quality based on each of the dimensions showed that from the users\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\' point of view, the dimensions of responsiveness, assurance, tangibles (tangible factors), reliability, and empathy have the lowest distance with the effectiveness limit. The obtained results of the test showed the significance level of the relationship between the dimensions of service quality in hypothesis 2 through the method of structural equations and the path analysis diagram. The assurance dimension has the highest relationship and the tangibles dimension has the lowest relationship with the service of quality. According to the librarians of the Central Library, the assurance dimension which has the highest significant relationship with service quality is to give more importance, they will see the effectiveness of service quality. The main findings of the research showed that the assurance dimension has the highest relationship with service quality and the tangible dimension has the lowest relationship with service quality.

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