The literature reason contains;: During the interaction of Poem and Fu, poem do not true the expressional model into his integral parts and cancel the express-feeling character.

• 文学原因表现为：在诗赋对流的过程中，诗歌吸收了赋的表现手法和技巧，但没有有机的融合，反而抛弃了抒情特征，转向体物。