Luding Bridge is located in Luding County, Sichuan Province, and is an important passageway to Kangba Tibetan area in the mainland of Sichuan. The bridge was built in 1705 (Kangxi 44), Kangxi Yubi book "Luding Bridge" three big words, and the royal monument at the bridge, the inscription text "Luding Bridge", the cross-approved "one unified mountain and river", Luding County hence the name. In May 1935, the Red Army Long March, with 22 warriors as the lead commando, gunfire, the edge of the iron rope forward, one stroke to eliminate the bridge to defend the enemy, the Red Army crossed the Dadu River, from the Red Army to seize the Luding Bridge feats sounded. "Jinsha water shoots the clouds and cliffs warm, Dadu Bridge cross iron rope cold." This poem recited from childhood echoed in my ears, walking on the Luding Bridge, feeling the rushing river from the foot, in the exhibition hall at the bridge, where to visit the "flying Luding Bridge" battle scene, I admire the courage of the Red Army soldiers. Tips: Luding Bridge is103.67 meters long and 3 meters wide; there are 13 iron chains in the bridge, two iron chains on each side of the bridge, and 9 iron chains on the bridge; each chain is composed of 862 to 997 iron rings, with a total of 12,164 iron rings; The two ends of the bridge are 20 meters high, the east end of the bridge is14.5 meters high, and the west end is5.2 meters high; the total weight of the bridge iron parts is more than 40 tons, of which the chain weight is 21 tons, and the average iron weight of each chain is1.6 tons; 1 horizontal Wolong pile and 7 vertical Dilong pile have accumulated more than 20 tons of iron; Each wooden plate is 3 meters long and0.1 meters wide, the main aisle plate in the middle of the cross bridge is0.75 meters wide, and the auxiliary aisle plate on both sides of the bridge is0.2 meters wide.