Chen Wei Sung was a well-known lyric writer in the early Ching Dynasty. Chen learned from the school of Yun-Chien poet in his young days, but traveled around in his middle age, so the writing style in the above two stages are different. Chen's early works were deeply influenced by Chen Tzu Long, including using short word to describe the sorrows and woes in a girl's heart, and also chanting more about objects. In Chen's late middle age, he lost country and home, failed in the national examination, and lived in wanting, so the way of his late writing were same as Chen Tzu Long. Because he lose his country and home in his middle age, so the way of his writing was changed from short word to long tune and the content were more about the sorrow for the defeated country. In the same time, because of Wu Mei Tsuen's influence, the way of Chen's writing can be divided in to the followings:1. Using short word in the early stage and long tune in the late stage, 2. Chanting history lyrics, 3. Describing the hardship of livelihood, and 4.refecting the pain of losing his country. Regarding the lyrics, Chen published the theory of lyrics in Kang-His 10, and he presented: 1. Revered the form of lyrics. He uplifted lyrics to the same position of classic books and history books, and he considered that "the functions of lyrics were for reserving classic books and history books". He also studied the relationship between a writer's work and his experience. 2. Considered vigorous and unrestrained lyrics and gentle lyrics could be exit in the same time. Chen thought that the writing character could be diversified of history, so his criteria for selecting lyrics included the above two styles of lyrics. 3. Uplifted the taste for lyrics. Chen considered that improving the taste for lyrics is indispensable for uplifting the position of lyrics. 4. Presented the saying of a distressed and afflicted life made a writer to complete delicate lyrics. Chen thought that lyrics should write something not only pathetic but also rigorous and unrestrained. 5. Lyrics should moral regret of losing country. The above concept was inherited from Wu Mei Tsuen's theory of poetry. The lyric theory in the late Chang Dynasty was deeply influenced by Chen's saying of a distressed and afflicted life made a writer to complete delicate lyrics.