With the upgrade to university of science and technology, the undergraduate students in the university are increasing year by year. Library services, specifically on providing teaching and research resources, are facing a challenge. For better service in the library, understanding library users’ behaviors and satisfactions is the threshold of the improvement. Under this situation, 1057 valid questionnaires from undergraduate students with different attributes as respondents were collected, and their behaviors and satisfactions toward utilization of library were analyzed. The results showed that 1. in terms of the purpose, the primary job of the respondents at the library was checking out and returning books, and there was a significant difference in academic system, gender, departments; 2. more than 60 percent of the respondents did not satisfy the collections of periodicals, and they had never accessed electronic resources provided by the library; 3. in terms of academic system, 98.4 percent of two-year college students had ever used periodicals in the library, but the periodicals did not meet their needs very much; 4. the satisfaction of the renewal services was the highest, but it had the lowest satisfaction to the departmental collections terms in the library; 5. over 50 percent of the students got their materials from the library bookshelves; 6. there was a significant difference in “ the satisfaction of circulation services”, “ the satisfaction of label way to the periodical” and “ the satisfaction of the quality and quantity of library collections” between the different academic system;7. there was a significant difference in both “the satisfaction of label way to the periodical” and “the satisfaction of display way to the periodical” in terms of the category of gender;8. there was a significant difference in both “the satisfaction of the readers reflect suggestion channel” and “the satisfaction of the quality and quantity of library collections” in terms of different departments.