本研究主要探討使用性評估應用於大學圖書館網站，並以國立臺灣師範大學圖書館作為研究個案，藉此驗證本研究所提出之使用性評估之成效。透過任務導向之使用性測試、放聲思考、系統使用性量表問卷、觀察與深度訪談法獲取受試者資料。試圖瞭解不同學科背景的使用者所認為圖書館網站使用性問題的差異，並發掘現有臺師大圖書館網站使用性問題，及針對該問題修正臺師大圖書館網站，再進行後測，以瞭解使用性評估是否具有成效。最後將此評估過程建立一使用性評估參考執行模式，提供有意針對大學圖書館網站進行使用性評估之研究者作為參考。
研究結果顯示不同學科背景受試者對臺師大圖書館網站使用性問題略有差異。而實際針對平均完成時間與平均完成時間變異數最大的三道任務修正臺師大圖書館網站使用性問題，且進行後測。結果顯示，修正後的臺師大圖書館網站受試者平均完成時間減少了56%的時間花費，而修正後所得之網站系統使用性滿意度明顯優於修正前，且後測受試者均能順利完成任務。顯示大學圖書館網站進行使用性評估確實能夠提昇使用者使用效率以及滿意度。
最後根據研究結果對現有之臺師大圖書館網站提出四點建議：一、以使用者角度建置網站；二、依照身份別提供服務；三、加強站方與使用者之間溝通的管道；四、妥善利用網站作為推廣管道。

This study is discuss apply usability evaluation on library website, and use National Taiwan Normal University library website for case study. By using task oriented usability testing, think aloud method, system usability scale, observation, and in-depth interview to acquire data. Trying to figure out the difference of usability problem between different disciplines, and discovering website usability problem of NTNU library website, then revise the website usability problem and re-evaluation.
The results shows there are some difference between different disciplines, and result of re-evaluation shows the user by using revised website which average time costs decrease 56%, system usability satisfaction of revised website is obviously better than original one and all the users can successfully finish the tasks. We believed in doing usability evaluation of university library can truly raise user performance and system usability satisfaction.
Four suggestions were proposed: First, website design should focus on user's view. Second, websites should provide service for different characters. Third, there should have more direct communication channel between website and users. Fourth, websites should use as well as an extension channel.

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