Introduction to Luding Bridge: Luding Bridge is 103.67 meters long and 3 meters wide. When building this bridge, skilled craftsmen from Yingjing, Hanyuan, Tianquan and other counties gathered here. Finally, the principle of cable crossing was adopted, that is, thick bamboo ropes were tied to both sides of the bank, and each bamboo rope was pierced with more than 10 short bamboo tubes. , then tie the iron chain to the bamboo tube, and then pull the rope that was tied to the bamboo tube from the other side, so skillfully pulling the bamboo tube and the iron chain to the other side.