Multi-contribution for one manuscript means that the same author or different authors of the same research group try or publish papers with the same or similar contents in two or more journals at the same time or successively without the knowledge of journal editors and reviewers.

Authors must be careful not to try to publish and submit more than one manuscript repeatedly. This kind of behavior not only seriously violates the copyright law and endangers the credibility of scientific and technological documents, but also is regarded as "endangering the author's integrity" and seriously affects the author's reputation or academic ability. Therefore, the author is advised to refer to the resources in the reference materials and read relevant case studies in order to understand and abide by the ethical submission norms. Other ethical issues in publishing include conflicts of interest in scientific research.