Guanlan Hakka folk songs are spread in all twelve communities where Hakka people live in Guanlan Street, Bao'an District, Shenzhen City, Guangdong Province. They are sung in the local Hakka dialect. According to Huang Qian, an 80-year-old mountain singer and veteran of the Dongzong in Guancheng Community, who recalled the history of his predecessor Huang Sifa and his predecessors singing folk songs, Guanlan Hakka folk songs have a history of at least 150 years. Its basic format is four-sentence seven-word style and five-sentence seven-word style. Among them, the first, second and fourth sentences of the four-sentence seven-word style rhyme, and the first, second, fourth and fifth sentences of the five-sentence seven-word style rhyme. The main singing forms are solo (individual singing), duet (double singing, one singing and one harmony), group singing (four people singing, five people singing), and chorus (multiple people singing). Improvisational singing is a performance form of superb artistic level, while the competition folk songs are the most intense, the most essential, the most attractive and the highest-level singing form. Guanlan Hakka folk songs, like those spread in Guangdong, Jiangxi, Fujian, Henan, Guangxi, Shanxi, Hubei, Hunan, Sichuan, Hong Kong, Macao, Taiwan and overseas Chinese communities around the world, have gradually formed a style with local customs and folk characteristics in the long process of evolution. The song structure is relatively uniform, the singing format is roughly the same, the singing methods include high-pitched falsetto, round-pitched original sound and low-pitched fine sound, and the rhythmic tone is the sound of flat flat and flat. It not only expresses emotions through scenery, but also expresses emotions through scenery, and expresses feelings through objects, and also expresses feelings through objects, reflecting a supreme realm of the fusion of emotions and objects. In terms of the types of folk songs, Guanlan Hakka folk songs are roughly divided into eight categories: lament, joy, love, praise, teaching, humor, wedding and funeral, and narrative. As for children's songs and riddles, they are also widely circulated. The main forms of folk songs include: fu-style folk songs, metaphorical folk songs, inspirational folk songs, reduplicated folk songs, pun folk songs, and love folk songs, which are the largest, most essential, and most exciting part. Lament folk songs and harmonious folk songs are also very distinctive. Guanlan Hakka folk songs are of great significance for studying the evolutionary history of the countless migrations of Hakka ancestors over the past two thousand years, their long-term coexistence with the local indigenous residents of Henan, Shanxi, Hubei, Sichuan, Hunan, Jiangxi, Guangdong, and Guangxi, especially the long-term coexistence of the original indigenous residents of Guanlan and the "locals" of the Cantonese language, learning from each other's strengths and weaknesses, and the integration, interconnection, and mutual influence of local folk songs, ancient folk songs, and Cantonese folk songs. It has a very important research value for studying the musical art and dialect characteristics of Hakka folk songs and even ancient music.