First of all, the researchers input the graduate thesis text into the duplicate checking system, and the system will match the text in full and compare it with the existing literature database. By comparing the similarity between text and other documents, the system gives the results of repeated inspection. This result can inform researchers of possible plagiarism or plagiarism in their papers, and remind them that they need to be revised and improved.

Different duplicate checking systems may adopt different algorithms and rules, so the results will be different. However, most systems provide a percentage to express the similarity between papers and other documents, which is convenient for researchers to judge and evaluate. The system can also mark the parts of the text that are similar to the existing documents, and provide corresponding reference documents or source files for researchers' reference.

The use of duplicate checking system is helpful to improve the academic level and quality of graduate papers. First of all, it can help researchers find possible plagiarism in time and avoid academic ethics and legal misconduct. Secondly, the system can guide researchers to modify and optimize the text, making the paper more unique and innovative. In addition, the duplicate checking system can also help graduate students improve their writing ability and standardization awareness, and develop good academic habits.

However, there are some limitations to the double-check system. First of all, it can only detect similar parts in existing literature, but can't detect similar contents in other works that have not been cited. Secondly, some systems may not be accurate enough to detect technical fields or specific disciplines, and it is difficult to identify and compare words or specific expressions in specific fields. In addition, the system's judgment of synonyms is not necessarily accurate, which may lead to false positives or false negatives.