The Middle Tang Dynasty was an important period for the Chinese literature history,so was the development and evolution of lie jing.The Middle Tang Dynasty,following the Early Tang Dynasty and the Prosperous Tang Dynasty,had four new changes in the mode of lie jing.From a comprehensive survey to the Middle Tang poems in The Complete Collection of Poem in the Tang Dynasty,lie jing was found to be commonly used in the Middle Tang Dynasty,and had a strong influence on the construction of artistic conception and the creation of rhythm beauty.However,there were still some lie jing examples which were seemingly right but actually wrong in the Middle Tang Dynasty poems,and these needed to be clarified.