Cao Ji Bai Yun Qu is an important cursive style in ancient China and an important way to learn cursive. The rhyme of cursive script helps to remember the structure of cursive script in the form of rhyme. It may have started in the Song Dynasty, but now we can't find its ancestors.
However, from the fifth literary category "Cao Ji Calligraphy" in the sequel of Shilin Guangji compiled by Chen in the Southern Song Dynasty, it can be seen that "Cao was popular at least in the Northern Song Dynasty.
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The main version of "Hundred Rhyme Grass Tactical Song";
The ancestor of "Cao Baiji Yun Ge" doesn't know its content now, but the most famous one is the person who signed "Cai Town" in the Northern Song Dynasty. He cut down the "cursive script" circulating in the market at that time and turned it into "Baiyun" cursive script, but his book is no longer circulating.
At present, the earliest edition of cursive script published is Yuan Dynasty engraving "Cursive Script Hundred Rhymes", with 76 rhymes and 760 words. But the carving is not precise, the scanned version is not fine, and the broken parts and ink stains are also common. Hong Kong Book Spectrum magazine, No.21to No.29, once had Yan Fu's annotation.