Educational scientific research can be divided into three types according to research purposes: exploratory research, narrative research and causal research. Exploratory research is a kind of research that makes a preliminary understanding of the research object or problem in order to gain a preliminary impression and perceptual knowledge, and provide the foundation and direction for more thorough and in-depth research in the future. Narrative research, also known as descriptive research, refers to the research that correctly describes the characteristics or overall picture of a certain group of people or a certain phenomenon. Its task is to collect data from chaotic phenomena, find out the situation, provide information and describe the main laws and characteristics. The study of causality, also known as explanatory method, mainly explores the causal relationship between a hypothesis and conditional factors, that is, on the basis of understanding what and how the phenomenon is, further clarifies or understands why things and phenomena are like this.