In 1049, during the reign of Emperor Renzong in the Northern Song Dynasty, it was also the most prosperous period in the Northern Song Dynasty. This year, in the capital of the Northern Song Dynasty, Kaifeng had a seemingly insignificant but far-reaching impact on later generations, that is, Song Renzong ordered the reconstruction of the Kaibao Temple Tower. Kaibao Temple is a royal temple in the Northern Song Dynasty. There is a wooden tower in the temple, which is dedicated to the Buddha relic of Ashoka. Unexpectedly, the wooden tower was only destroyed for 55 years and was burnt down by lightning. In order to prevent fire, the material of the tower was changed to iron-brown glazed tiles. The tower was built on the Yishan Mountain, with a lotus base under the tower. The Yellow River has been flooded many times since the millennium, and Kaifeng City has been submerged again and again. Together with Yishan and the lotus base, it has been buried underground. Today, only the tower body on the ground can be seen. Because the tower is iron brown, since the Yuan Dynasty, the tower has been called the "iron tower." The glory of Kaifeng City during the Northern Song Dynasty, slowly disappeared with the glory of time, only this tower, silently watching the city's millennium changes. The current tower is the symbol of Kaifeng in the ancient city. It is 55.88 meters high and has 13 floors. It has been subjected to dozens of earthquakes, the flooding of the Yellow River, the hail disaster and the artillery bombing of the Japanese invaders. It is still called the first tower in the world. Kaibao Temple in the Northern Song Dynasty, once owned 24 Buddhist temples, facing south. The current tower park is much smaller. After passing through the temple, it is the tower.