The internal causes include the imbalance of literary development, the interaction of literary factors and the alternation and collision between retro and innovation. Specifically, the imbalance of literature development is reflected in three aspects: the imbalance of style development, the imbalance of dynasty development and the imbalance of regional development. The interaction of literary factors includes the mutual influence, transformation and promotion between vulgarity and elegance, the mutual penetration and integration of various styles, and the alternation and collision between retro and innovation. In addition, Taoism, Buddhism and the idea of responding to citizens' demands also exert external forces on literature from different directions, affecting the development of literature.
To sum up, the development of China literature is influenced by external factors such as politics, economy, culture, nationality and geography, as well as internal factors such as the unbalanced development of literature, the interaction of literary factors and the alternating collision between retro and innovation.