My dear friends，first of all，congratulations on you will become a real "hero"，because today we are going to be on the Beijing badaling Great Wall，really realize the artistic conception of "not a true man unless he comes to the Great Wall".

The Great Wall is the symbol of the Chinese nation，is the pride of Chinese people，this is the worlds longest defensive in ancient buildings. The earliest the Great Wall built in the spring and autumn period and the warring states period，after two thousand years，it throughout northern China，winding，grand thin，from space can use one of the wonders of the human eye can see two human. Everyone knows that there are to sings: "the Great Wall Wan Lichang..." How long is the Great Wall? Really have Wan Lichang? Only appeared in the history of Chinas one of the Great Wall?

The Great Wall in the history of China can be more than one，its length is different also. As early as the Great Wall of qi in the spring and autumn period and the warring states period，according to the Great Wall of qi. Then，a ChuChangCheng. Later，yan，zhao，qin and other countries have also built the Great Wall，the minority nationalities in the north of defense. But the length of the Great Wall is no more than one thousands of miles，so cannot be called "Great Wall". The presence of a truly Great Wall in Chinese history after qin shi huang unified China.

In 221 BC，the qin dynasty destroyed the sixcountries and unified the world. In order to be able to keep jiangshan，Jesus Christ，to the starting of the throne of the emperor qin shi huang sent prince ying fusu and general meng tien，north to the wall connection，reinforcement of all countries，and extended，thus formed in the history of Chinas first truly "Great Wall". It stretches more than ten thousand，shi said qin wall. In the han dynasty，the emperor on the one hand，general wei ch ing，huo qubing crusade against the huns，on the other hand sent zhang qian to the western regions，on the surrounding of the ethnic minority areas to take tough love. Not only that，in order to "do not call ma degrees yinshan hu"，not only reinforce the original qin wall，and built an article in the north of the former qin wall outside the Great Wall，the length of the Great Wall to nearly 2 miles. The han Great Wall the Great Wall is the longest in the history of our country. After the han，many dynasties have all completed the Great Wall，only two dynasties have not completed before the Ming dynasty Great Wall，you know what two dynasties?

History，practical yuan dynasty did not repair the Great Wall，the reason is that datang power is strong，the diplomatic success，WaiFan，Great Wall area of datang land on either side，so have not completed the Great Wall. The yuan dynasty was founded Mongol dynasty，is a force to conquer the global powerhouse，is the largest country in the territory in the history of our country，who dare to make? Is coupled with the mongols from the north of the Great Wall in the central plains，why the outlet from building walls it?

The last time in the history of large-scale repair the Great Wall is the Ming dynasties，Ming emperor wrest power from the mongols，its capital in nanjing，in order to strengthen border，resist the Mongolian remnant，so after the succession sent general managed and four late emperor zhu di，north to build the Great Wall. A total overhaul of Ming dynasty Great Wall 18 times，has lasted for more than 150 years，until youre done，this is the east of shanhaiguan，west to jiayuguan this Duan Ming the Great Wall，the total length of more than 12700，this is the Great Wall we said today.

Today，the Great Wall is no longer a military defensive measures，and join the people of the world become the bond of friendship. In 1987，UNESCO listed in the catalog of world cultural heritage to the Great Wall.