the four archways in Puyang, also known as the central pavilion, is located at the intersection of the cross street in the old town of Puyang. It was established by Hou Ying (a native of Puyang), the imperial adviser who made a great contribution to the promotion of the capital in the 16th year of Ming Zhengde (1521). (Long Dayou was appointed as the "Ming Dow Academy" in the second year of Kaizhou Zhizhou, and Hou Dajie, a student in Kaizhou, donated his family field to study in Ming Dow Academy. Long Dayou was very moved. Long Dayou also missed the justice of Hou Chun, his grandfather, and Hou Ying, his father, and set up four archways in the heart of Crossroads to celebrate Hou Jia's righteous deeds. ) The pavilion is 8.6 meters high, 6.6 meters long and 6.6 meters wide, with an area of 43 square meters. The building is of wood and stone structure, square, and the four corners are supported by stone pillars. The top of the pavilion is made of all wood, and the tenon is tight. The four corners are supported by brackets, and the eaves of the pavilion are covered with glazed tiles, and the green light flashes. Eight squatting lions are sculpted on the top ridge, which is lifelike. Each of the four vertical ridges shapes a dragon, a phoenix, a fish and a horse, showing the shape of a dragon and a phoenix dancing and a fish leaping like a horse.

The four corners of the vertical ridge are covered with bronze bells hanging from animals, and the wind swings and jingles. The pavilion is decorated with patterns, carved beams and painted buildings, which is very beautiful. The four foreheads on the outer wall are carved like a bucket, vigorous and powerful, written by calligrapher Liu Wenxuan. It is said that Zhuan Xu is the capital in the east, the old county in the west, the river plastic protection in the south and the key lock in the north, which summarizes Puyang's long history and important geographical position.

"Zhuan Xu's Legacy Capital" said that it was once the capital of Zhuan Xu among the Five Emperors. In fact, the capital of Zhuan Xu is not in the old town of Puyang, but in the ruins of Gaocheng, ten miles southeast of the old town. After Zhuan Xu's death, people called it "Zhuan Xu's Market", or Diqiu. During the Spring and Autumn Period, the capital of Weiguo moved here and was still called Emperor Hill. Later, Wei declined, and people changed Diqiu to Puyang (about 24 BC) because Pushui flowed through the south of the city. During the reign of Emperor Wu of the Han Dynasty, the Huangzikou dike of the Yellow River was not repaired for more than 2 years, which caused Diqiu City to be flooded. The present Puyang county was founded in the late Jin Dynasty after the Five Dynasties, and developed to its peak after the alliance of the Northern Song Dynasty.

Zhuan Xu emperor ruled the area of "secluded tombs in the north, crossed toes in the south, quicksand in the west and Panmu in the east" (Historical Records of Five Emperors), which was roughly equivalent to the territory of Qin Shihuang after he unified China. When the Yellow Emperor ruled China, there was no fixed imperial capital. Since Zhuan Xu, the capital has been Diqiu, and China has since produced its first capital.

"Lock the key to the North Gate" and "Heshuo Guarantee" happened in the Song Dynasty, when the Liao State established by the Qidan nationality invaded the Central Plains in the south, and the important geographical position of Puyang (then known as Ganzhou) played a barrier role in blocking its invasion.

in 14 ad, Liao invaded the south to the city of Song Zhenzong, and under the advice of Prime Minister Kou Zhun, he crossed the Yellow River to the north city of Zhangzhou (now Puyang) to fight against Liao. Later, the Liao and Song Dynasties negotiated peace and concluded a peace treaty, which was called "the alliance of the Yuan Dynasty" in history. Liao invaded the Central Plains and was defeated at the gates of Puyang many times. Liao regarded Puyang as a forbidden area, and Song also took Puyang as a northern barrier, from which came the "north gate lock key" and "Heshuo guarantee".

"the old county of Luoyuan" has a long history. Geyuan is an inland lake located in the west and south of Puyang. Chanyuan County was first seen in the Spring and Autumn Period and belonged to Weiguo. The county was located in the south of Chanyuan Lake, and its main function was to manage the lake area. In the Spring and Autumn Period, the vassal league was here twice. In 553 BC, Qi and Jin fought for the command of the small countries of Lu, Wei and Cao. After several years of war, it was difficult to draw a conclusion. In this case, they held peace talks (with the participation of 13 vassal states) in Chanyuan, and finally concluded a contract. In 543 BC, the Song State suffered from famine, and it was still the above countries that met in Chanyuan to discuss the rescue plan for the Song State, and finally reached a rescue agreement. In 241 BC, Qin occupied Diqiu and established Dongjun. In 948 AD, the state government moved to Desheng South City and changed Desheng City to Zhouzhou City (now Puyang County is Desheng North City).

The sixteen characters on the balustrade of Sipailou summarize the ancient civilization and important geographical position of Puyang.

The lettering on the original Sipailou is not the same as it is now. Jiajing's "Kai Zhou Zhi" contains: "Four Pailou Square, in the middle of the cross street, with the East Bianxian Deputy and the West Capital Xian, is the capital of South Zhuan Xu, the hometown of North Ji An, and the Zhizhou Dragon stands tall ...". The inscription on the present Sipailou is "Zhuan Xu's Legacy Capital in the East, the Old County in the West, the River Plastic Security in the South and the Lock Key in the North", which was written by Liu Wenxuan, a famous calligrapher from Puyang, after being repaired in 1982.