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Although Liu Yong's social status is low, he expanded and developed Slow Ci, opened up the subject matter of Ci, enriched the expression techniques of Ci, and absorbed a large amount of popular colloquialisms. It made great contributions to promoting the transformation and development of Song Ci.
Liu Yong's reputation in the history of literature is not good. He is called "Gray Liu", which means "the three changes of Liu Yong". This nickname is considered disgraceful, but Liu Yong It had a very important effect on the development of Ci. Liu Yong's most obvious contribution is the development of the form of slow Ci and long tune. Liu Yong wrote a large number of slow lyrics and long tunes, which were sung for a while among the popular singers, but they were not valued by the upper class of society, or were admired in secret, and treated with disdain overtly. Because of Liu Yong's poem "Xixie popular custom", although it is self-contained, it is not of high quality. Wang Zhuo commented on Liu Ci and said: "Those who don't know how to read are especially fond of it. I have tried it to compare with the wealthy children in the capital. Although they are out of the countryside, their voices are disgusting." This criticism is quite harsh, saying that you, Liu Qi, are at best a petty bourgeoisie and dare to join the upper class? Although he is glamorous, he is still just a philistine upstart.
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