Plank road originally refers to a road built along the cliff. Also known as the pavilion road, complex road. China had already built trestles during the Warring States period. King Hui of Qin built the Baohui trestle road, 235 km long, from Baogu to Meili County (today's Mei County) in Shaanxi Province. Jin Niu Road was built during the Qin Dynasty's invasion of Shu, which was later called the South Trestle Road, with a length of 247.5 kilometers. Modern roads have become a network, but in the mountainous areas where traffic is blocked, there are still similar trestles for people and animals to pass. The aerial passageway between tall buildings in ancient China is also called trestle road. The meaning of the plank road is now more extensive, especially in the real estate industry with more, such as the garden interesting stair shaped wooden road, known as the wooden plank road. "Plank road" also known as "stack" way, which is a great invention in the history of ancient communications. In order to pass the road in the deep mountains and canyons, and it is smooth and unimpeded, they will dig some prism-shaped holes with utensils on the cliffs and cliffs cut off by the river, and insert stone piles or wooden piles in the holes. It is paved with wooden planks or flagstones, and can be used for pedestrians and traffic, which is called trestle road. In order to prevent these wooden piles and boards from being spoiled and rotting by the rain, a pavilion (also called gallery pavilion) was built on the top of the plank road. Coherent address, is called the way of stack, short for plank road.