Bean bag is a nursery rhyme in Beijing, which originated in Beijing and spread in Beijing. Beijing's long history has produced a heavy cultural accumulation, and a large number of nursery rhymes have appeared. They are sung among folk children, and their syllables are harmonious and humorous. They have accumulated excellent national culture and rich educational content, and have been selected into the second batch of national intangible cultural heritage lists in China.
There are ten forms of expression of Beijing nursery rhymes, such as thimble, cross talk, tongue twister, ballad proverb, lullaby, riddle, chain tune, counting song, question and answer song, parallelism and so on, which have strong local characteristics through written literature inheritance and oral inheritance.