Natural science: Natural science is the study of natural phenomena, such as mathematics, physics, chemistry and biology. Historians can use natural science methods and techniques to study historical issues, for example, by analyzing the chemical composition of ancient cultural relics to infer the lifestyle and environment of the ancients.

Social science: Social science is the study of human social phenomena, such as politics, economy, psychology, ethics and so on. Historians can use social science methods and techniques to study historical issues, for example, by analyzing historical documents to understand the political system and cultural background of ancient society.

Historical research: Historical research is a major branch of the field of history, and its research objects are mainly historical events and people. Historians study historical events and figures by means of archaeology, historical literature collation and historical compilation, so as to deepen their understanding and understanding of history.

Philosophical research: Philosophical research is a subject to explore human thoughts and wisdom, including philosophical speculation, philosophical history, philosophical language and so on. Historians can understand human thoughts and values in historical periods by studying philosophical thoughts and philosophers' thoughts.

Religion is a discipline that studies religion, including religious theory, religious history, religious culture and so on. Historians can understand the culture and values of historical periods by studying the development and evolution of religions. Cultural studies is a discipline that studies culture, including cultural introduction, cultural history and cultural comparison.

Psychological research is the study of human psychological phenomena, such as child psychology, developmental psychology, social psychology and so on. Historians can use psychological methods and techniques to explain historical events and people's behaviors and decisions. Anthropological research is the study of human culture, society and behavior.

Through the study of the above aspects, historians can fully understand the past historical events and cultural phenomena, so as to better understand and understand the development and evolution of human society. Historical research not only helps us to understand the past history and culture, but also provides us with valuable experiences and lessons, thus guiding us to better face future challenges and opportunities.