Laojungou is a trough-shaped dangerous road, the boulder on the side of the step, like the trace of being dragged, very realistic. It is rumored that too old Jun drove the green cattle across Huashan, saw that there was no way, and he took off his body and took it as he wanted to, and opened this road, so he was named Laojungou. In ancient times, people went up and down Huashan Mountain from the stone nests on both sides of the trench. Until now, people can still see the stone nests on both sides of the trench. As for the trench marks, it should be formed by long-term rainwater. The top of the old Jungou, there is the mountain and river of the Republic of China period anti-Japanese famous general Wang Yaowu.