The four poets of "Four Spirits of Yongjia" are all Yongjia people, namely Zhao Xu (word), Ji Xu (name Lingyuan), Weng Juan (word Lingshu) and Zhao Shixiu (name Lingxiu). Their font size has a spirit word, so they are called "Yongjia Four Spirits". This school of poetry, also known as the "Four Spirits School", represents a tendency of poetry creation in the late Southern Song Dynasty.
The poetic features of Yongjia Siling are very similar to those of Jia Dao. Most of this school's works are roaming the scene, praising rural life and expressing the feelings of traveling and entertainment singing, but there are also a few poems that reflect social reality. In terms of artistic form, the "Four Spirits School" is good at approaching the body, especially at the five laws, and its poetic style is simple, focusing on forging words, refining sentences and double laws. Their landscape poems are concise in language and beautiful in sentence patterns. However, due to narrow interests and weak constitution, the Siling School has not achieved much. However, their poems of "self-expression" corrected the habit of Jiangxi school to take people by words to a certain extent, giving people a refreshing feeling and making "Song poetry change again".
The emergence of the "Four Spirits School" still depends on the cultural environment at that time. The first is to "correct the losses in Jiangxi". The last stream of Jiangxi Poetry School specializes in finding materials in books, almost copying the same books, using reference instead of creation, and using patchwork instead of innovation. The second is dissatisfaction with Neo-Confucianism poetics and poetry. Due to the prevalence of Neo-Confucianism in the Southern Song Dynasty, rhyming "quotations" and "lecture notes on Taoist poems" appeared, which lacked poetry and image. Theoretically, the Four Spirits advocated not relying on allusions, not discussing, but emphasizing the expression of personal feelings in an attempt to find another way. They followed the example of Jia Dao and Yao He in the Tang Dynasty and pursued Jia and Yao's "wild and thin" style.