Yuanqu was developed on the basis of Song Ci, so their genres are very similar. If we want to distinguish Song Ci from Yuan Qu in genre, we should first look at whether its title is epigraph or qupai. For example, the song "Tianjingsha" in question belongs to a qupai. Of course, some qupai also exist in epigrams, so it is necessary to compare the syntax of words and qu. Relatively speaking, the requirements for the number of words used in the text are relatively strict. There is no difference or little difference in the number of words in the same position of the same epigraph, and "between lines" is rarely used. On the contrary, Qupai can add a lot of lines, and often the original sentence of three or five words can be extended to ten digits.
Besides, the rhyme is different. The rhyme still follows the poetic rhyme, which can be divided into upper and lower parts. The rhyme adopts thirteen rhymes of the Central Plains, and does not enter the rhyme.