Core journals generally require the duplicate checking rate of papers to be between 5%- 10%, but the specific standards may be different for different journals and types of papers.

Some core journals may require the duplicate checking rate of papers to be within 8%, while others may require the duplicate checking rate of papers to be within 10%.

In addition, if the paper is plagiarized or copied, the journal editor may ask the author to revise and copy it again to meet the requirements of the journal.

Therefore, the author should understand the requirements of the target journals for duplicate checking rate before submitting the paper, and make targeted revisions and improvements to ensure the quality and academic integrity of the paper.