Internal audit: generally speaking, it is the magazine's audit of the font format, language expression, sentence logic and repetition rate of the paper. Internal audit is based on some problems that are easy to occur. External audit: mainly depends on whether the quality of the paper reaches the level of periodical submission, which is the audit of professional quality knowledge. External audits take a long time because they sometimes verify the data appearing in the documents. In order to test whether the experimental data and methods in the paper are scientific and whether the conclusions are in line with the development of the industry.