On April 18, 2009, the data of the Great Wall was first released: from the east to the Yalu River on the shore of Liaoning Hushan, west to Juyongguan, and the construction of Qilian Shandong to Gansu Jiayuguan. Among them, the length of the artificial wall is 6,259,6 kilometers; the length of the wall is 359,7 kilometers; The natural risk length is 2,232,4 kilometers. The wall of the dangerous area in the east is made of stone and blue brick, which is very strong. The Great Wall of Ming rises from the Yalu River to the east, connects the Great Wall of Qin, and then west to Jiayuguan, more than 6,000 kilometers. It is magnificent and a miracle in the world at that time.