Cao Jianbiao's couplet collection is the first couplet collection in Qingyuan. At the same time, it contains seven calligraphy works 17 by famous calligraphers in Qingyuan, such as Huang Bangjie, Ruan Zhiming, Lei Zhitong, Ou, Cao, Wu Shaoning, Deng Wensheng, He, He, Chen, and Lin He Hao.