Epic is an ancient narrative poem, which narrates the legend of heroes or major historical events. Based on ancient heroic songs, they are collectively composed and created, reflecting historical events or myths and legends of great significance in human childhood. Epic is the earliest spiritual product of mankind, which is of great significance to our understanding of early human society. Epic is an ancient narrative poem, which narrates the legend of heroes or major historical events. Epic has a natural connection with ancient myths and legends. Epic is produced on the basis of mythical world outlook, and its development is ultimately a denial of mythical thought. According to the content reflected, epics can be divided into two categories: creation epics and heroic epics. Creation epic, also known as "primitive" epic or myth epic, is a collective creation based on ancient heroic songs, reflecting historical events or myths and legends of great significance in human childhood. The epic of creation mostly uses artistic fiction to shape the image of famous heroes, which has a grand structure and is full of fantasy and magic. The oldest epic in the world is the forgotten Babylonian epic. China's Biography of King Gesar, Indian Mahabharata and Ramayana, and ancient Greek Heriat and Odyssey are all famous epics. Heroic epic is a kind of poem with a long narrative style, which tells the story or deeds of heroes (from history or mythology). Homer's epic Iliad and Odyssey are typical examples. The earliest epics have a strong connection with oral poetry and are often borrowed by literary scholars. The earliest and most obvious example is Aeneas, which uses the same form and theme as Homer. In modern Chinese, the word "epic" is often used to refer to fictional literary works, which are characterized by huge background, numerous characters, numerous fictional regions and long time span. Typical examples are Star Wars and so on. Modern times sometimes refer to influential and magnificent excellent narrative works (such as novels) that reproduce life in a certain historical period as epics or epic works. As a genre, epic is the result of long-term development and evolution, and the development process of various epic traditions is very different. In the process of its formation and development, epic absorbed the nutrition of myths, legends, stories and other folk narrative literature, and even borrowed the achievements of lyric folk songs and other genres, forging its own unique theme content, artistic thinking mode and poetic system. Although epic has the characteristics of organic synthesis to a certain extent, it can not be measured by the standards of any school, nor can it be measured by the standards of all these schools. It should be said that epic has digested various folk oral expressions, and the application of these forms is epic-oriented. In other words, from the perspective of literary types, epics represent language and artistic achievements that have been fully developed in a specific oral tradition and reached a higher stage. When it comes to epic, we are familiar with the exposition of epic from Hegel to Marx and Engels. They understand epic from the perspective of philosophy and aesthetics and the historical development of human society. In their view, epic is the crystallization of national spirit, an unattainable artistic model created by human beings in a specific era, and a product of a specific historical era. These discourses are based on the external characteristics of literature and art, and the disintegration of primitive society has created a good historical foundation for the grand background of heroic epic. Legends about tribal wars, ethnic migration and outstanding military leaders have prepared some materials for the formation of heroic epics. It should be said that heroic epic is a panoramic reflection of people's lives in a certain historical era. Every epic is specific to history and nation. We can't dissect a specific epic with an abstract model of the general historical era, nor can we cut the rich national cultural connotation of the epic with the ruler of the general human society. Epic has a special connection with history, but even if the historical imprint of epic is very distinct, it is not a chronicle record, or even an artistic reproduction of specific historical events. Epic has a special way of summing up history, which embodies the creator's understanding and performance characteristics of history and reality.