In the application process, the number of papers to be published will be specified, and the project number will be marked before publication. At the end of the project, the research situation of the project will be judged by the quantity and quality of the papers under this project number. Because the previous paper has been published, it can no longer be marked with the project number, so it can not be counted as the result of this project. Therefore, you can't use the previous papers to do the topic.

The declared project is organized by the project organizer. Each project organizer has its own business scope, for example, in the field, some focus on education, some focus on medical care, and some focus on others. Different fields have different topics.