Design of library lending management system based on UML (1) system analysis (including system description (problem domain description), use case model and analysis class diagram). (2) System design (including design class diagram, sequence diagram, state diagram, component diagram and other logical models of the system. (3) System realization (including information coding design, database design, input design, output design, user interface design, processing design and final program design). (4) After the programming is completed, several test cases are designed and tested on the computer, and the designed program system is passed. (5) The format of the design report shall be prepared according to the requirements of the annex. The contents of the main body of the course design report should include: 1. Description of the problem; 2. Use case model description and analysis class diagram; 3. Description of design class diagram, core use case sequence diagram, state diagram and component diagram; 4. Description of information coding design, database design, input design and output design; 5. Description of user interface design and process design; 6. Give the test methods and results of the software. 7. Features, shortcomings, gains and experiences of the design.