The number of words in the abstract of undergraduate thesis should be controlled between 150-250 words, depending on the requirements of the school or college. We should briefly summarize the research purpose, methods, main achievements and conclusions of the paper, and highlight the innovation and value of the paper. Too long or too short may affect readers' understanding and judgment of the content of the paper. Strictly abide by the regulations of the school or college when writing the abstract to ensure the quality and accuracy of the abstract.