Mr. Zhang Jian’s handwritten couplets have been handed down to many generations. The author has seen more than a hundred ink pictures of Zhang Jian’s couplets. This is the only official script couplet work. Zhang Jian's calligraphy is in regular script, official script, running script and cursive script. Most of his calligraphy is in regular script and official script. His calligraphy is mostly in regular script and official script. Official script is rare, and official script couplets are even rarer. One of the couplets is official, and the other two are in the form of dragon-men pairs. The writing style is thin and hard, flying vertically and horizontally, which captures the essence of the "Stele of Ritual Vessels" and "Ode to the Stone Gate". It occasionally references the style of seal script, which is quaint and fresh. The best of the best are increasingly rare.