Let's put it this way: due to the limited space of periodicals, periodical papers can only be elaborated in limited space, so periodical papers emphasize refinement, and usually some dissertations are used in periodical papers. Generally speaking, there is a need for innovation in themes, methods, viewpoints and models. Of course, some general journals don't have that many requirements, just pay. The paper emphasizes a thorough, comprehensive and meticulous understanding of the problem. The length is generally more than 30 thousand words, and the doctoral thesis is longer. Almost a book is divided into many chapters, and each chapter has different arguments.