Sanxingdui (Chinese: 三星堆; pinyin: Sānxīngduī; literally: "three stars mound") is the name of an archaeological site and the previously unknown Bronze Age culture for which it is the type site. Sanxingdui is now believed to be the site of a major ancient Chinese city in what is now Sichuan, China. The Bronze Age culture which was first discovered in 1929 and then re-discovered in 1986 when archaeologists excavated remarkable artifacts, that radiocarbon dating dated as being from the 12th-11th centuries BCE. The culture that produced these artifacts is now known as the Sanxingdui Culture, and archeologists are identifying it with the ancient kingdom of Shu. The artifacts are displayed in the Sanxingdui Museum located near the city of Guanghan.
The discovery at Sanxingdui, as well as other discoveries such as the Xingan tombs in Jiangxi, challenges the traditional narrative of Chinese civilization spreading from the central plain of the Yellow River, and Chinese archaeologists have begun to speak of "multiple centers of innovation jointly ancestral to Chinese civilization."
Many Chinese archaeologists have identified the Sanxingdui culture to be part of the ancient kingdom of Shu, linking the artifacts found at the site to its early legendary kings. References to a Shu kingdom that can be reliably dated to such an early period in Chinese historical records are scant (it is mentioned in Shiji and Shujing as an ally of the Zhou who defeated the Shang), but accounts of the legendary kings of Shu may be found in local annals.
According to the Chronicles of Huayang compiled in the Jin Dynasty (265–420), the Shu kingdom was founded by Cancong (蠶叢). Cancong was described as having protruding eyes, a feature that is found in the figures of Sanxingdui. Other eye-shaped objects were also found which might suggest worship of the eyes. Other rulers mentioned in Chronicles of Huayang include Boguan (柏灌), Yufu (魚鳧), and Duyu (杜宇). Many of the objects are fish and bird-shaped, and these have been suggested to be totems of Boguan and Yufu (the name Yufu actually means fish cormorant), and the clan of Yufu has been suggested as the one most likely to be associated with Sanxingdui.
The more recent discoveries at Jinsha 40 km away that has close link to the Sanxingdui Culture are thought to be the relocated capital of the Shu Kingdom. It has also been suggested that the Jinsha site may be the hub and capital of Duyu clan.
The Sanxingdui archaeological site is located about 4 km northeast of Nanxing Township, Guanghan, Deyang, Sichuan Province. The site is a walled city belonging to the Sanxingdui Culture founded c 1,600 BCE. The trapezoidal city has an east wall 2,000 m, south wall 2,000 m, west wall 1,600 m enclosing 3.6 km2, similar in scale to the inner city of the Zhengzhou Shang City.
The city was built on the banks of the Yazi River (Chinese: 涧河; pinyin: Jiān Hé), and enclosed part of its tributary, Mamu River, within the city walls. The city walls were 40 m at the base and 20 m at the top and varied in height from 8–10 m. There was a smaller set of inner walls.
The walls were surrounded by canals 25–20 m wide and 2–3 m deep. These canals were used for irrigation, inland navigation, defense, and flood control. The city was divided into residential, industrial and religious districts organized around a dominant central axis. It is along this axis that most of the pit burial have been found on four terraces. The structures were timber framed adobe rectangular halls. The largest was a meeting hall about 200 m2.
In 1929, a farmer unearthed a large stash of jade relics while digging a well, many of which found their way through the years into the hands of private collectors. Generations of Chinese archaeologists searched the area without success until 1986, when workers accidentally found sacrificial pits containing thousands of gold, bronze, jade, and pottery artifacts that had been broken (perhaps ritually disfigured), burned, and carefully buried. The first sacrificial pit was found on the site of the Lanxing Second Brick Factory on July 18, 1986. The second sacrificial pit was found a little less than a month later on August 14, 1986 only 20–30 meters from the first one.
Bronze objects found in the second sacrificial pit included male sculptures, animal-faced sculptures, bells, decorative animals such as dragons, snakes, chicks, and birds, and axes. Tables, masks and belts were some of the objects found made out of gold while objects made out of jade included axes, tablets, rings, knives and tubes. There was also a large amount of ivory and clamshells. Researchers were astonished to find an artistic style that was completely unknown in the history of Chinese art, whose baseline had been the history and artifacts of the Yellow River civilization(s).
All the Sanxingdui discoveries aroused scholarly interest, but the bronzes were what excited the world. Task Rosen of the British Museum considered them to be more outstanding than the Terracotta Army in Xi'an. The first exhibits of Sanxingdui bronzes were held in Beijing (1987, 1990) and the Olympic Museum in Lausanne (1993). Sanxingdui exhibits traveled worldwide, and tickets were sold out everywhere; from the Hybary Arts Museum in Munich (1995), the Swiss National Museum in Zurich (1996), the British Museum in London (1996), the National Museum of Denmark in Copenhagen (1997), the Solomon R. Guggenheim Museum in New York (1998), several museums in Japan (1998), the National Palace Museum in Taipei (1999), to the Asian Civilisations Museum in Singapore (2007).
Nevertheless, despite the interest in the excavated finds, the site itself suffered from flooding and pollution, and was for this reason included in the 1996 World Monuments Watch by the World Monuments Fund. For the preservation of the site, funding was offered by American Express to construct a protective dike. Also, in 1997, the Sanxingdui Museum opened near the original site.
The culture of the Sanxingdui site is thought to be divided into several phases. The Sanxingdui Culture which corresponds to periods II-III of the site, was a mysterious civilization in southern China. This culture is contemporaneous with the Shang Dynasty, however they developed a different method of bronze-making from the Shang. The first phase which corresponds to period I of the site belongs to the Baodun, and the final phase (period IV) the culture merged with Ba and Chu cultures. The Sanxingdui culture ended, possibly either as a result of natural disasters (evidence of massive flooding were found), or invasion by a different culture.
The culture was a strong central theocracy with trade links to bronze from Yin and ivory from Southeast Asia. Such evidence of independent cultures in different regions of China defies the traditional theory that the Yellow River was the sole "cradle of Chinese civilization."
This ancient culture had a well developed bronze casting culture which permitted the manufacture of many impressive articles, for instance, the world's oldest life-size standing human statue (260 cm high, 180 kg), and a bronze tree with birds, flowers, and ornaments (396 cm), which some have identified as renderings of the fusang tree of Chinese mythology.
The most striking finds were dozens of large bronze masks and heads (at least six with gold foil masks originally attached) represented with angular human features, exaggerated almond-shaped eyes, some with protruding pupils, and large upper ears. Many Sanxingdui bronze faces had traces of paint smears: black on the disproportionately large eyes and eyebrows, and vermillion on the lips, nostrils, and ear holes. Vermillion is interpreted "not be coloring but something ritually offered for the head to taste, smell, and hear (or something that gave it the power to breathe, hear, and speak)." Based upon the design of these heads, archeologists believe they were mounted on wooden supports or totems, perhaps dressed in clothing. Liu Yang concludes "masked ritual played a vital role in community life of the ancient Sanxingdui inhabitants", and characterizes these bronze ritual masks as something that may have worn by a shi 尸 (lit. "corpse") "personator, impersonator; ceremonial representative of a dead relative".
The shi was generally a close, young relative who wore a costume (possibly including a mask) reproducing the features of the dead person. The shi was an impersonator, that is, a person serving as a reminder of the ancestor to whom sacrifice was being offered. During such a ceremony, the impersonator was much more than an actor in a drama. Although the exact meaning may have been different, the group of Sanxingdui masked figures in bronze all have the character of an impersonator. It is likely the masks were used to impersonate and identify with certain supernatural beings in order to effect some communal good.
Another scholar  compares these "bulging-eyed, big-eared bronze heads and masks" with "eye-idols" (effigies with large eyes and open mouths designed to induce hallucinations) in Julian Jaynes's bicameral hypothesis; and  proposes, "It is possible that southern Chinese personators wore these hypnotic bronze masks, recursively representing the spirit of a dead ancestor with a mask that represents a face disguised by a mask."
Other bronze artifacts include birds with eagle-like bills, tigers, a large snake, zoomorphic masks, bells, and what appears to be a bronze spoked wheel but is more likely to be decoration from an ancient shield. Apart from bronze, Sanxingdui finds included jade artifacts consistent with earlier Chinese neolithic cultures, such as cong and zhang.
As far back as Neolithic times, the Chinese identified the four quadrants of the sky with animals: Azure Dragon of the East, Vermillion Bird of the South, White Tiger of the West, and Black Tortoise of the North. Each of these Four Symbols (Chinese constellation) was associated with a constellation that was visible in the relevant season: the dragon in the spring, the bird in the summer, etc. Since these four animals — birds, dragons, snakes and tigers — predominate the finds at Sanxingdui, the bronzes could represent the universe. It is unclear whether they formed part of ritual events designed to communicate with the spirits of the universe (or ancestral spirits). As no written records remain it is difficult to determine the intended uses of objects found. Some believe that the continued prevalence of depictions of these animals, especially in the later Han period, was an attempt by humans to "fit into" their understanding of their world. (The jades that were found at Sanxingdui also seem to correlate with the six known types of ritual jades of ancient China, again each associated with a compass point (N, S, E, W) plus the heavens and earth.)