In the center of Bangkok, in front of the Jade Buddha Temple of the Old Palace, Wang Jiatian covers an area of about 75 Lai (,,,,,,,). It can be said that Thailand's National Square, the royal family and religious ceremonies are held here, as well as the perennial ancient national movement, where performances and competitions are also held. The correct translation should be Wangjia Square. However, it is generally called Wangjiatian, but it is also true. Long ago, it was a vast farmland. And every Spring Farming Festival, the Wangs hold celebrations here. During the Dacheng Dynasty more than two hundred years ago, it was indeed the place where rice was planted and where people held cremation ceremonies. Red-headed boats from mainland China come here with the monsoon in the South China Sea. When they enter the capital city, most of them will stop by the riverside to do some business, and then continue to go to the big city. By the end of the Great City Dynasty, some Chinese had already lived here. King Zheng moved his capital to swallow Wuli, making this area more prosperous by the river, and has become a small town. King Rama I, who built his capital in Bangkok, built the palace nearby (today's Jade Buddha Temple), before moving the Chinese to the riverside along Songyue Road and Sanping Road. At this time, Wang Jiatian began to take shape gradually, but also to make cremation sites, built a special Royal crematorium. It was not until Rama III that Wang Jiatian was officially named. The royal family moved all the major religious ceremonies and royal celebrations here. During Rama IV, kite competitions were held here, followed by other national sports, which were held here every year, such as Thai boxing, Thai chess and rattan ball. In 1882, when King Lama V returned from his visit to Europe, he saw that all countries in Europe had national squares, which could be used as national celebrations or as places for people's gatherings. So he decided to reorganize and expand Wang Jiatian, remove crematoriums and irregular buildings. From the chairs in front of the palace to the sun pier, the site is planned as an ellipse. Around Wangjiatian, acid horn trees are planted. They are divided into inside and outside rings, 840 outside rings and 820 inside rings. After more than one hundred years, these trees are still preserved. After the renovation and expansion of Wang Jiatian, many major royal and religious ceremonies were held here, and many grand events and recreational sports were held. Apart from kite racing and national sports in March and April, horse racing, racing and golf competitions have been held here, as have the world famous circus. Wang Jiatian has hosted Bangkok's Centennial celebration, the 2500 Buddhist calendar "the 25th Century of Buddha's Birthday" and the bicentennial celebration of the capital. Wang Jiatian is not only the place for ceremonies and celebrations, but also the center of Bangkok. Many important buildings, scenic spots and historic sites are surrounded by it. It is also the most important transportation center in Bangkok. There are dozens of bus routes, and many places have to be traveled by special buses here. So from day to night, people are surging.