Literary writing and thought in Yong Ming period developed around the idea of "using the four tones for seeking new changes".Theory of rhythm was the most distinct trait of literary thought in Yong Ming period
"The natural rhythm"in chinese literature began to be "artificial rhythm".Jiangyan’s FU criticism idea was combined with his writing
but Xietiao embraced Luji’s FU criticism idea.Shenyue’s FU criticism idea embodied the literary spirit of Yong Ming period.