From Xiaoyaohe Hydropower Station, the first pass on the Jiangnan is the first hillside of the Huihang Ancient Road, about 1,400 levels of bluestone steps, about half an hour on foot, and the average person also passed the first physical limit here. This door is actually very simple, composed of 4 large stone strips of natural rocks, the door is engraved with "Jiangnan First Pass" in the west, and the east engraved with "Huihang Lock Key", which is rumored to be named after the Ming Dynasty anti-suffering famous Chen Hu Zongxian. A concrete platform has been built here, which is an excellent viewing spot. Looking forward, the ancient road winds along the mountains on the left; looking down, a long and wide river runs through the valley, and boulders can be seen everywhere in the river, and the stone plank road to Xiaoyao Valley has been built by the river; Back and forth, the stone steps up were long, narrow and steep, and a large river was sandwiched between the two mountains, and a wide field was in the distance.