Their forms are all four-character rhymes, the handwriting is horizontal and vertical, the cloth surface is neat, the strokes are quite even and vigorous, the style is dignified and rigorous, meticulous, the structure of the characters is tight and loose, the feet are elongated, and there is a condescending state, which seems that readers must look up. The artistic style of uniformity, harmonious rules, uniformity, calmness and strength is consistent with the spirit of the Qin Dynasty at that time. These inscriptions have a certain influence on the calligraphy of later inscriptions.

In the Tang Dynasty, Zhang Huaihuan defined Li Si's seal script as a "miracle" and praised it as "picturesque as a stone, with flying words", calling it "vigorous and even, and wonderful in Fiona Fang". It can be seen that Li Si's calligraphy is steady and well-proportioned, and his statutes are strict, so there is a saying in the calligraphy circle that "learning seal script must be based on' Li Er' (Tang and Li in Qin Dynasty)".

The lines of Yishan Monument are round and smooth. Results Symmetrical balance. Slim and slender fuselage, exquisite and elegant style, can be described as noble style. In addition, inscriptions are rigorous, dignified and steady, and temporary writing can especially strengthen the function of wrist "lifting" and enhance the sense of "center", which is the best model for learning books.