The long street in history was blocked by the snake, ending at the southern foot of the snake mountain. The street from the north of Snake Mountain to the gate of Francisco yamen is called Simenkou. In the late Ming Dynasty, people were superstitious about geomantic omen. They wanted to preserve the Daming Mountain by destroying the sanitation of the second mountain of tortoise and snake, dig through the snake mountain (and cut off the turtle head at the same time), and extend the long street to the gate of the Francisco yamen, but they still used to call the northern part of the mountain the Simen Gate. When this road was expanded in 1935, the old Francisco yamen was opened at the northern end, which extended the road to Zhongshan Road, cut the snake mountain in the middle, and put on the reinforced concrete snake mountain bridge, which extended the general name of Simenkou to the south of snake mountain, almost including the main commercial downtown area of Jiefang Road today.