1. The graduation thesis is simple in structure, simple in expression and few in substance. It is only to meet the requirements of the length and number of words of the thesis and extract a large number of documents and contents on the Internet. Through the identification of the paper duplicate checking system, the duplicate checking rate of the paper is too high.

2. Many undergraduates write graduation thesis with too little original content, and many of them "borrow" other people's papers. The conception and specific design of the whole paper are others'. Therefore, there are a lot of similar duplicate contents in the paper, which can not avoid the detection of the paper duplicate checking system, and finally lead to a high duplicate checking rate.

3. Someone can finish a high-level graduation thesis, express the theme of the thesis well and execute it well. However, due to their limited creative ability or weak scientific thinking, some contents can not be described more vividly and accurately with image tables. They just use the quoted materials and introduction to fill the gaps in this area, and finally the paper duplicate checking system detects a high duplicate checking rate.