The standard and principle of paper duplication checking is to ensure the originality and credibility of the paper. The following are several common standards and principles for repeated inspection of paper:

Duplicate checking rate: duplicate checking rate is one of the important criteria for duplicate checking of papers, which refers to the percentage of repeated words in papers. Generally speaking, the school will have a specified check rate standard, such as 10%. If the duplicate checking rate of papers exceeds this standard, it may be considered as academic misconduct such as plagiarism.

Originality: one of the principles of duplicate checking is to ask the paper to be original. This means that most of the contents in the paper should be thought, studied and written by the author himself. If a lot of content in the paper comes from other people's research results or documents, it may be regarded as plagiarism without proper quotation and annotation.

Citation and reference: The principle of duplicate checking also includes correct citation and reference format. When citing other people's research results or documents in the paper, it should be marked according to academic norms, and a complete list of references should be listed at the end of the paper. If the quotation is not standardized or the format of the reference is wrong, it may also be regarded as plagiarism or violation of academic norms.

Text duplication: Paper duplication check will also detect text duplication in paper. If some words in the paper are highly similar to the contents of existing documents without proper quotations and comments, they may be regarded as plagiarism.

In a word, the criteria and principles of paper duplication checking are to ensure the originality and credibility of the paper and to abide by academic norms and moral standards. Students should pay attention to avoid academic misconduct such as plagiarism and improper quotation when writing papers, so as to ensure that their papers can pass the duplicate checking test.