"The question is: Will the master thesis not be sampled after a few years?" After five years, the master thesis will not be sampled. Taking the school as a unit, if the unqualified rate of sampling inspection exceeds the standard, check the papers for 3-5 years. The specific auditing standards of sampling inspection: the topic is broad or does not meet the requirements of professional training or worthless, the writing elements are missing or the titles are different or the number of words is not up to the requirements or too many, the structure and logic of the paper are chaotic, the application of professional knowledge or ability is not reflected, the graphic format is not standardized or academic misconduct such as plagiarism occurs. The accuracy of duplicate checking results is relative. Because of the existence of self-built database, the most accurate results can be obtained by using the duplicate checking system submitted by the school without copying the last paper.