Sui and Tang dynasties, Song and Yuan dynasties of China's feudal culture, what are the characteristics of each, the reasons are what

Features: the Sui dynasty style of literature is flashy and insubstantial, began to appear words. Simple reason: by the Wei Jin and North and South Dynasties, the influence of extravagance is caused. Characteristics: The Tang Dynasty was the heyday of poetry, the word has developed, the emergence of legend. Simple reason: the emergence of ancient literary movement. The open policy and the realistic and developed empire. Characteristics: Song Dynasty was the heyday of words, with novels and songs. Simple reason: after the development of Tang poetry, the word is another cultural height, which is the trend of historical and cultural development. Characteristics: During the Yuan Dynasty, the song had its heyday, while the novel also had a greater development. Simple reason: the Yuan Dynasty, a foreign name, there are greater restrictions on culture, folk theater that is the Yuanqu, the late development of rapid and enter the heyday.