Conditions. Several poems describing the frontier war and garrison life are the seeds of frontier poems in Tang Dynasty. The artistic style is handsome and bold, fantastic and sharp, which directly inherits the Jian 'an tradition and has great influence on later generations, such as Li Bai, Cen Can, Gao Shi and Du Fu. In artistic form, he made great efforts to study and create Yuefu poems, with more than 80 poems, including three words, five words, seven words and miscellaneous words. Five-character poems are exquisite, round and smooth, rich in content and full of feelings. Seven-character poems change rhyme sentence by sentence, which can be changed freely, broadening the creative road of seven-character poems. His Yuefu poems break through the traditional Yuefu rhythm, are extremely creative, profound and implicit in thought, fresh and quiet in artistic conception, large in language capacity, changeable in rhythm, colorful and fluent in rhetoric, incisive and lyrical, and have the characteristics of folk songs. Shen Deqian said: "Mingyuan Yuefu, like the chisel of five mountains, is unprecedented in the world. After being too white, it often works "(Volume 11 of Ancient Poetry Source). Wucheng Fu expresses homesickness with the prosperity of Guangling in Han Dynasty and the desolation at present, and is regarded as one of the representative works of lyric small Fu in Six Dynasties. Prose basically belongs to parallel prose. "Climbing the Leian and My Sister's Book" combines lyrical arguments, with ups and downs in style, gorgeous rhetoric and long prose.