According to the "Great Mountain Taihe Mountain Annals" of the Ming Dynasty, the Wulong Palace was built on the site of the old buildings of the Yuan Dynasty, and it was stated: "Its palace faces east, and its gate faces north when folded backward." The path inside the palace gate is full of twists and turns. This passage indicates that in order to make up for the west-facing east orientation of the palace, it is necessary to "reverse the folding of its doors" to make them run north-south. After changing its course, it conforms to the saying, "The qi scatters with the wind, and the boundary water stops." The ancient requirement of "gathering without scattering and acting with restraint" indicates that this is a masterpiece of the feng shui masters of the Yuan and Ming dynasties, in line with the way of heaven and earth. This passage also indicates that upon entering the gate of the Five Dragons Palace, there is a "nine twists and eighteen turns" double-walled path. The round and smooth arc-shaped walls, with the special color of red walls and green tiles, not only reflect the luxurious grandeur of imperial architecture but also the mystery and mystery of Taoism. Unfortunately, all of this has become the past. What we see in the picture is only the foundation of the palace walls. The creativity and imagination of the ancients are astonishing. If we approach here, we will find that the hidden drainage channel by the wall is also extremely magical. The underground drainage system project of Wulong Palace is huge. There are many branches inside the stone culverts. Some people think that these branches form a bagua layout, and it is very difficult to turn out after entering. The underground spring water in Wulong Palace is extremely abundant, and its unique drainage system structure is still worthy of exploration and reference to this day.