The research methods of philology include document collection, identification, arrangement and utilization. Among them, document collection is the basis of philology research and one of the most important links. There are many ways to collect documents, such as libraries, archives, museums and society. On the basis of literature collection, it is necessary to identify and sort out the literature to ensure the scientific and reliable literature obtained. Finally, through the analysis and synthesis of the obtained literature, a conclusion about a certain problem is drawn.