There is a pavilion and a pass at the foot of the hill on the upper part of the street of Longwangyuan Wharf Market Town. The pass is called "Heqing Gate" and it was the only place for merchants to enter the hinterland of Hedong. After crossing Heqing Gate, there is a zigzag corridor leading to the top of the mountain. There is a rather unique stele pavilion in front of Heqing Gate, with a four-cornered cross ridge. There is a stele in the pavilion, namely "Heqing Gate Stele". It was established by Yao in the Qing Dynasty (1869). There are inscriptions all around. They are titled "Our Wills Unite like a Fortress".The content of the inscription records the battle between the Qing Army and the West Nian Army in the fifth year of Tongzhi in the Qing Dynasty (1860). It is the important material to study the history of Xinian Army going on an expedition to the east. There is also Hukou Four Inscription Steles, which were erected in the twelfth year of Tongzhi in the Qing Dynasty (1873). They mainly records the deeds of Shanxi Army Gate and Huai Army Admiral Zhang Shuping leading the Huai Army to build the Great Wall in Hukou for four years. Its title is "comprehensive merits and virtues". The first line of the couplet is "Bizhangnan drives to dig He Shuqin stacks", and the second line of the couplet is "the Yellow River lays straight to the west".

The Hukou Waterfall cuts the transport by water in Yellow River into two sections and becomes a natural obstacle. It prevents ships from passing through the river. Therefore, the boatmen had to berth and unload the cargo at the Dragon King’s upstream of the waterfall. The cargo was carried down by livestock, while the boats were towed by manpower to the rocky shore. The boats were pulled by trackers to the slow water flow downstream of the waterfall, and then entered the water to load the cargo and descend downstream, which is called " Sailing on dry land". In order to facilitate the "sailing on dry land", the shallow trenches washed out by the flood for many years were slightly drilled and repaired on the rocky bank of the Yellow River at that time to become a channel for sailing. The most obvious relic of the existing "sailing on dry land" is a channel from Longwangyuan in the north to the east bank of the Yuan Dynasty cable bridge in the south.

During the Ming and Qing Dynasties, water transportation on the Yellow River was busy. In order to meet the demand of "sailing on dry land", Longwangyuan naturally formed a flood and dry wharf and market town on the east bank of Hukou. During the prosperous period, the wharf was built up and down three-level streets, with 63 businesses, including money houses, pawn shops, leather shops, dye shops, salt shops, pharmacies, and guest houses. This wharf flourished in the Ming Dynasty, prospered in the Qing Dynasty, and declined before the Anti-Japanese War. It has experienced more than 400 years. There are 100 holes in the existing cave dwellings, row upon row at a distance, with unique style.

In the past, due to the special shipping method of "sailing on dry land" in the Hukou section, it was necessary to convene a quartet pack team and the local "liugutou" for various economic activities. The pack team used cows and horses as their main means of transportation, so they set up a OX and Horse King Temple to express their wishes to pray for the horses and cows to be strong and free from epidemics.

OX and Horse King Temple is located at the southern end of Longwangyuan Street of Ming-Qing Dinasty Wharf. It was originally composed of Horse King Temple, Temple of the God of Wealth, Wuwen Temple, Le Building and Shanmen. It was founded in the fifty-fifth year of Emperor Kangxi of the Qing Dynasty (1716), and now only a Horse King Temple of stone structure, several steles and Le Building remain. Horse King Temple stele was erected in the 9th year of Tongzhi in the Qing Dynasty (1870). It mainly records that the temple was burned during the fierce battle between the Nian Army and the Qing Army. The general soldier Yan Wenzhong and others advocated the local chambers of commerce and 63 shops to raise funds to repair the temple process.

Due to the narrow river channel in Hukou, especially the Shili Dragon Trough freezes in winter, it is very easy to pass through. Therefore, its strategic position on the entire Yellow River is extremely important, and it has been a battleground for military strategists in all generations. In the fifth year of Tongzhi in the Qing Dynasty (1866), in order to prevent the West Nian Army Zhang Zongyu from leading his troops to cross the river east, the Qing government sent the Huai Army admiral Zhang Shuping as the commander-in-chief of the river defense. He supervised the construction of a section of the Great Wall. It starts from Pingduguan in Daning County on the east bank of Huri in the north, and ends at Mazi Beach in Xiangning County in the south. It is 75 kilometers in length, parallel to the Yellow River. The shape of this section of the Great Wall of the Qing Dynasty is the front wall and the back trench, which is a fortified position. Longwangyuan has a central command post with the remains of the "Heqing Gate" and the "Four Inscriptions Pavilion". There are sub-command posts in the Kenan town in the north and Dragon King Temple in the south. The existing remains from the Dragon King Temple stele to Nanyuan Goukou are relatively complete, about 2 kilometers long. This section of the Great Wall is the latest Great Wall ever discovered. Its discovery has had a considerable influence both at home and abroad, providing a new subject of physical history for the study of Great Wall Studies, and extending the lower limit of the construction history of the Great Wall of China for more than 200 years.