1, different in nature: DOI is the unique identifier of literature resources in Wanfang database; Wanfang database is a thesis database.

2. Different functions: DOI is used to ensure the sustainable positioning and citation of documents; Wanfang database can search academic documents, conference papers, doctoral and master's papers, newspapers, yearbooks and other resources.

3. Different security: DOI can be found in Wanfang database; Articles in Wanfang Database can be searched for free, but they need to be downloaded for a fee.