The current research situation of the project is also called "a summary of related research at home and abroad", that is, it briefly describes or summarizes what others have done in this research field or related research, how they did it, what problems have been solved, and what problems have not been solved, thus providing a background and starting point for their own research. It is also conducive to finding breakthroughs and innovations in your own projects. If we say the format, it is basically to sort out the relevant research and its results first, and pay attention to the best organization and classification, which is a kind of learning in itself. Classification is the most basic research work. Then these studies and achievements are reviewed, and their similarities and differences, advantages and disadvantages are summarized. That's about it.