Introduction to the second pass: The second pass is located in a steep place with deep valleys, steep cliffs and dense vegetation. The building is a border checkpoint-style valley blocking building, covering an area of ​​more than 200 square meters. According to the 70th chapter of "Water Margin" According to the description, it was guarded by two leaders, Lu Zhishen and Wu Song, and was one of the dangerous passes into Dazhai.