The criteria for duplicate checking of journal papers are usually set by editorial departments or academic institutions themselves, but most journals will use some recognized duplicate checking tools, such as Turnitin and iThenticate. The following are some common repeated inspection criteria:

1. originality: journal papers must ensure the originality of the content and cannot copy other people's research results. The duplicate checking tool will compare the paper with other documents in the database, and if it finds highly similar content, it may be judged as plagiarism.

2. Citation and references: When quoting other people's opinions or research results in a paper, accurate citations and references must be given. The double-check tool will check whether these citations and references are accurate and consistent with the contents of the paper.

3. Language and format: There are also strict requirements for the language and format of periodical papers. The duplicate checking tool can check whether the language of the paper is standardized and whether the format meets the requirements of the journal.

4. Data and experimental methods: If the paper involves data collection or experimental methods, the duplicate checking tool may check whether these data and methods are accurate and reused.

5. Paper structure: The duplicate checking tool can check whether the structure of the paper is reasonable and whether the contents of each part are coherent.

6. Repetition rate: Generally speaking, the repetition rate of journal papers cannot exceed a certain standard, which is usually set by the journal editorial department or academic institutions themselves. Papers with high repetition rate may be rejected for publication.

Generally speaking, the duplicate checking standard of periodical papers aims to ensure the originality, accuracy and standardization of papers, so as to maintain academic integrity and improve academic quality.