Technical documentation. Patents are only divided into three categories: inventions, utility models, designs, and domestic and foreign patents. The thesis is also divided into 369 grades, various grades and categories. Patents and papers belong to the category of technical documents, but they are essentially different. Patent is a kind of technology, and only when it meets the requirements of novelty, creativity and practicality can it be qualified to apply for authorization. Papers are scheduled to be published in academic journals, sometimes purely theoretical, without too many restrictions on the content.