They are dissatisfied with the style of "liberal poets" who neglected the art of poetry after the May 4th Movement, and advocate the aesthetic principle of "rational emotional control" and the concept of formal metrical poetry. In order to realize this theoretical principle, the crescent poets made a useful attempt in the art of poetry. First, they created objective lyric poems, that is, they changed the lyric way of "expressing their feelings directly" into an objective confrontation of subjective feelings. Then use imagination to pretend to be the outline of a vague image and turn subjective emotions into concrete images. This paper opposes the disorder and prosaic tendency of poetry, and makes a serious exploration of the metricalization of new poetry from theory to practice. Wen Yiduo put forward the famous thought of "three beauties" in his poetic meter, namely, "the beauty of music (the beauty of syllables), the beauty of painting (the beauty of words) and the beauty of architecture (the symmetry of sections and the neatness of sentences). It was put forward in view of the scattered form of new poetry at that time. This proposition laid the theoretical foundation of the new metrical school and made some contributions to the development of new poetry. Therefore, the crescent school is also known as the "new metrical poetry school". The crescent school corrected the weakness of the early poetry creation which was too informal, and also made the new poetry enter the period of independent creation.
Late theory
In the later period, the Crescent School put forward the principles of "health" and "dignity", adhered to the position of "pure poetry" which was super-utilitarian, self-expression and aristocratic, and emphasized "purity of essence, thoroughness of technique and rigor of meter". However, the artistic expression and lyricism of poetry are close to modernist schools.