Search technology is one of the basic technology of artificial intelligence. In the various application areas of artificial intelligence, it has been widely used. The search algorithm is the core of search technology, and all of the search algorithm optimization are mainly in the classic search algorithms to improve them. Therefore, the classic study of search algorithms has a very important theoretical value and practical application value. In this paper, several classical search algorithms for research, analysis, conclusion are studied, making knowledge formation a system and facilitating better learning and research. Finally, the article compares several algorithms listing their strengths and weaknesses so that it is easy to select the appropriate algorithm to solve relevant practical problems.