The techniques of Zhang Hei's Epitaph and Zhang Qianbei's techniques written by calligrapher Lu Aiguo are published by Forbidden City Press, and they belong to the third series of "Techniques Series of Ancient Monuments in the Forbidden City". This series selects the most representative works in the collection of steles in the Forbidden City, and invites calligraphers with special research to analyze and explain the skills of temporary writing from various angles according to their many years of temporary writing experience, covering basic strokes, pen characteristics, radicals, shelf structure, knot characteristics, homonyms, original temporary learning and so on. It is a set of reference books specially prepared for temporary learning and studying famous steles.