Hou Ma's Letter of Alliance was an agreement signed by Zhao Yang, an official of the State of Jin in the Qing Dynasty, and Dr. Qing from 15 to 23 years at the end of the Spring and Autumn Period (497-489 BC). 1965, the Shanxi Provincial Cultural Relics Working Committee found that the excavation time of the Jinguo site in Houma, Shanxi Province was from June of the same year 165438+ 10 to May of the following year. The Book of Alliance is also called Carrying Books. "Zhou Li Meng Si" "The Law of Holding the Alliance" notes: "Those who hold the alliance will write their words in the strategy, kill them, take their blood, add books to them, and bury them, which is called the book." At that time, in order to consolidate internal unity and combat hostile forces, governors and Qing doctors often held such vows. The book of alliance is made in duplicate, one of which is hidden in the government of alliance, and the other is buried underground or submerged in the river to win the trust of ghosts and gods. Hou Ma's letter of alliance was written on a piece of jade with a brush. The handwriting is generally vermilion, and a few are black. The font is close to the bronze inscriptions in the late Spring and Autumn Period. Its discovery is of great significance to the study of China's ancient oath system, ancient Chinese characters and the history of Jin State. Mengshi Site Excavation Mengshi Site is located in the southeast of Houma Jinguo Site, covering an area of about 3,800 square meters. It is divided into two parts: the book burial area and the sacrificial burial area, and the book burial area is concentrated in the northwest. There are more than 400 pits (pits where sacrifices are buried) found in the Meng site, and the sacrifices are generally buried at the bottom of the pits. Cattle, horses and sheep are buried in big pits, and sheep or Shu Meng are buried in small pits. There is also a small niche at the bottom of the northern wall of most ridges, in which a jade offering called "coin" is placed, and several pieces are buried in some pits. There are no shrines and jade coins in the ridge where the book of alliance is buried. These jade coins and sacrifices are all sacrifices given to God or ancestors when taking an oath. Jade coins used as sacrifices are jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade, jade. Most of the jade pieces used to write the League Book are in the shape of Gui, the largest is 32 cm long and nearly 4 cm wide, and the smallest is 18 cm long and less than 2 cm wide.