The font of the poem is seal script, and later generations called this kind of writing on the stone drum "Shiguwen". The font of the stone drum inscriptions inherits the inscriptions of the Western Zhou Dynasty and the small seal script of the Qin Dynasty, which is of great value. Where the pen is folded horizontally and vertically, a square is contained within the circle. The vertical painting at the turning point is retracted and gradually stretches downwards as it goes downwards. Its momentum is rugged and graceful, and it does have the powerful hegemony of the Qin Dynasty. However, it tends to be more square and rich. The beginning and end of the strokes are all sharp, round and vigorous, the structure is lengthened and shortened, and it is well-proportioned and moderate. The ancient majestic beauty is the best in ancient and modern times.
Shiguwen is the culmination of the large seal script and the first of the small seal script. It plays a role in the history of calligraphy as a link between the past and the future. Shiguwen has been regarded as an important model for the practice of seal script by calligraphers of all dynasties, so it is known as "the first rule of calligraphers".