1 China HowNet: This website provides a large number of excellent academic thesis resources, including graduation thesis, master thesis and doctoral thesis. Users can register on the website and buy download rights, or borrow from some university libraries.

20,000 square database: This website is a well-known academic thesis database in China, providing tens of millions of academic resources, including graduation thesis and degree thesis. Users can purchase download rights on the website or borrow them from some university libraries.

3Google Academic: This is a network search engine that can search academic articles for free, and can help users find academic documents including journal papers, dissertations, books, abstracts and technical reports, covering natural sciences, humanities, social sciences and other disciplines.

All the above websites can provide inquiry and download services for dissertations, and the specific website you choose depends on your personal needs and the resources provided by your institution.