Wang Guowei's Ci Hua on Earth was one of the most important works in the history of Chinese literary criticism and was known as the "crown of Ci theory". The book proposed that "Ci is a kind of literature" and "literature is a reflection of society", which had a profound impact on Chinese literary criticism and literary creation. The book mainly elaborated on the principles and methods of literary creation and criticism. He believed that literature was a kind of aesthetic activity, an expression and perception of human beings towards nature, society and life. The creation of literature could not be separated from true feelings. It required the author to have superb emotional expression ability and aesthetic vision. On the other hand, literary criticism was a kind of analysis and evaluation of literary creation. It required an in-depth exploration of the author's creative ideas and artistic style based on the content and extension of the literary work. The book also put forward the view that Ci was an organism, emphasizing the independence and uniqueness of Ci as an art form. He believed that Ci was an important style of Chinese literature, with unique aesthetic value and cultural significance, which needed to be integrated and developed in coordination with poetry, prose and other literary forms.