The master's thesis can be revised before it is submitted for review. Duplicate checking and submission of paperless master's thesis are two different links. Duplicate checking is to compare papers and detect their duplication with other documents, so as to evaluate the originality and academic integrity of papers. Submission is to submit the paper to professional judges for review, so as to evaluate the academic level of the paper and the feasibility of the research results. Master's thesis can be revised and improved before it is submitted for review, so as to further improve the quality and originality of the thesis.