Seal type: 1. The ancient seal of the Warring States period is the general name of the pre-Qin seal. Most of the earliest seals we can see now are ancient seals in the Warring States period. The strokes of seals are as thin as hair, and they are all cast. The ancient seal script in white language is made by adding more side bars or vertical grids in the middle, and the characters are cast and chiseled. In addition to the names of Sima and Situ, the official seal has various irregular shapes, and the content is also engraved with auspicious words and vivid objects. 2. Qin seal refers to the popular seal from the end of the Warring States Period to the early Western Han Dynasty, and the characters used are called. Look at its calligraphy style and Qin and Han dynasties, Qin stone carvings and other characters are very similar, are more popular than the ancient prose in the Warring States period. Qin seals are mostly carved in white with a square surface. The official seal used by junior officials is about half the size of the general square official seal, rectangular and square, which is called "semi-pass seal". Private seals are generally rectangular, but also round and oval. In addition to official names, personal names and Kyrgyz, there are proverbs and idioms such as "respecting things", "thinking about success" and "being harmonious with the people". 3. In a broad sense, the official seal of the Han Dynasty is the general name of the official seal from the Han Dynasty to the Wei and Jin Dynasties. Compared with Qin Zhuan, the seal is more neat, straight, square and vigorous in style. At the end of the Western Han Dynasty, the handicraft industry was very developed, so the official seal ("Xin" was the name of Wang Mang's dynasty) was particularly exquisite and vivid in the times. seal cutting in the Han Dynasty reached its peak and became a model for later seal engravers to learn. The official seals of the two Han dynasties are mostly white, all of which are cast. Only a few troops are in urgent need of carving the official seal of the brothers instead of casting it, which will be introduced later. 4. China Private Seal China Private Seal is a private seal in the Han Dynasty, which is the largest and richest kind of ancient seal. Not only do they have different shapes, but they are all made of cinnabar and white, or decorated with patterns such as four spirits, and there are also multi-sided printing, overprinter (mother-child printing) and hook printing. In addition to the name, the printed words often include Ji language, native place, table characters, and auxiliary words such as "seal", "private seal" and "letter seal". The button system is extremely diverse, which fully shows the ingenuity of Han craftsmen. Private printing in the Han Dynasty was still dominated by white, engraving in the Western Han Dynasty and chiseling and casting in the Eastern Han Dynasty. 5. The General Seal is also a kind of official seal of China. These seals are often temporary dispatches on the way to March, and they are engraved on the printed surface with a knife, which is also called "urgent printing". Pu Yin's unique style is full of interest and has a great influence on his later artistic style. In the Han dynasty, generals used seals, which are generally called "seals" rather than "seals", which is a major feature of military seals.