Above the cliff wall on the west bank of Longmen Gorge, there are countless neat and square stone holes in turn, which is the relics of the ancient plank road of Daning River. The plank road stone holes are mostly square, the aperture is 20 cm square, and the hole depth is about 30 cm. The upper and lower holes are interlaced into the word "pin", the upper row of two holes inserted wooden piles, the wooden board, the lower hole inserted wooden column oblique support board, forming a triangular support frame, so as to build a "plank road" for people and animals to walk. The ancient plank road is mainly based on Daning River. From Longmenxiakou, through Wuxi County, to Zhenping County, Hubeixi County, and Chengkou County, Chongqing, we have been to Ningchang Ancient Town there is also this plank road, which is estimated to be the same. The total length of the Daninghe plank road is about 400 kilometers, and its length exceeds the famous Jiange plank road, which is second to none in the relics of the ancient plank road in China.