Cui Yuanhe Du Cao is good at cursive script, and Cui Yuan is Cui Du's "Cui". He was a calligrapher in the Eastern Han Dynasty in China, whose name was Yu Zi. He is a native of Anping, Zhuo Jun (now Hebei), especially good at cursive writing. He studied under Du Du and was called "Cui Du". His cursive works are known as "the sage of grass", and Zhang Zhi once studied his calligraphy, which had a great influence at that time.
Du Cao, whose real name is Jingzhao (now Chang 'an District, Shaanxi Province), is the "Du" of Cui Du. He is famous for his excellent book Cao Zhang, and he is also called "Cui and Du" with Cui Yuan.