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Refers to the old farming for the nation to deal with war, civil use, such as masonry materials, Du Yi used as a defense built around an obstacle to building. As early as the Ming Dynasty to establish ago, when Zhu Yuanzhang capture Huizhou, a hermit named Zhu's up to tell him it should be "high wall, grain, the relief win." Zhu Yuan adopted the recommendations. When the reunification of the country, he will prefecture command the universal fortification. Zhu Yuanzhang that "the world is beautiful, but, as in the Qin-risk." Xi'an Ancient City Wall in the city's boom, presided over by the British Pu captaincy general, in the Tang Imperial on the basis of the old city with the expansion.

After the expansion of the Ming Dynasty in Xi'an city wall 12 meters high and 12-14 meters Dingkuan, Dikuan 15-18 meters, about 13.7 kilometers week. Wall at 120 meters repair an enemy of Taiwan, prominent in the walls, roof and the city-wall. It is designed to climb the city shot and killed the enemy of the set. Enemy half the distance between Taiwan, just in the bow and arrow with a range of effective, easy shot from the side of the enemy siege. A total of wall on the enemy Taiwan 98, and above all has the unmanning Dilou.

Ancient weapons behind, Shing Mun is the only access, so here is a feudal ruler's hard focus on defense. East of Xi'an in the west, north and south of the Shing Mun four were being floor, Jian Lou, triple-Shing House gates. Gate House, in the most, their role is to lift suspension bridge, in Jian Lou, and positive on both sides of a square with a window for the use of archery. In the House, is the most, is the main entrance of the city. Jianlou between the floor and is used to connect the wall, called Weng Cheng, is the troops. Weng Cheng also the first horse to the city, there is no relief steps to facilitate the horses up and down. The city also has a horse Road 11. 1.40 outside the city walls have a prominent corner of Taiwan. In addition to the southwest corner is a round, is likely to maintain the status quo corner of the Tang Imperial, the other is a square. Xiu angle on the stage there is more to Taiwan than the enemy tall turret, shows that the war here in the important position.

On the outer walls of buildings which have cog, also known as the pile wall, a total of 5984, there Duokou, archery and observation. The inside wall as the wall of women, no Duokou to avoid walking between the soldiers had fallen into.

The original city wall of Xi'an Loess complete with tiered rammed into play, with the bottom soil, lime juice and glutinous rice mixed rammed play, abnormal hard. Later the entire inside and outside the city wall built on top of the wall and brick. Every 40-60 meters at the top of the wall have a green-brick structure with a sink for drainage, the ancient city wall of Xi'an, long-term protection from a very important role.

You Kuanyou a city surrounded by deep Cheng He is on the Shing Mun Department has always ups and downs of the suspension bridge. Up a suspension bridge, access roads in and out of the city was cut off.

Ming Dynasty City Wall of Xi'an has a large and sophisticated military defense systems, China is also one of the most complete existing ancient castle. Xian, the ancient castle show that China's ancient wisdom of working people, we also study the history of the Ming Dynasty, military construction and provides a rare kind of information.

With a stone wall to resist fire, as well as bows and arrows and other weapons to attack the project so that the enemy can not function in the absence of equipment such as scaling ladders and siege towers, climbing up steep walls. The wall at the top of the defender may be down or archery are hurled objects to the siege attacks. Siege and therefore are completely exposed to the open space, compared to defend those who have a strong defense to sit down and shooting advantage in the siege when the shooting appears to be up quite a disadvantage. If the wall is built on steep cliffs or other high places, and the effectiveness of its defense value would be enhanced. Shing Mun on the walls and entrances and exits will be narrowed as much as possible in order to provide a greater degree of defense.

Courtyard by main building, things around the room in the middle courtyard layout of the traditional form of residential collectively. In the residential areas in China's oldest and most widely distributed, is typical of the Han nationality in the form of residential areas. Three thousand years of its history, the Western Zhou Dynasty, had already begun to take shape in the form. Shanxi, Shaanxi, Beijing, Hebei, the most representative of the courtyard.

The courtyard in the southeast corner to open the door to the general or the north-west corner, the hospital is the main building of Beifang, the main building with masonry structure built on the platform, than other large-scale housing, the owner of the house is the living room. The yard has things on both sides of the room, is the younger generation have a place to live. In the main building between the rooms and corridors built, for people to walk and rest. Wall Street and the courtyard houses are generally not external windows, homes closed and quiet environment.

The courtyard door for the general distribution of the first into the hospital lobby, the second hospitalization, the House, such as residential, are on both sides of the room, there is room corridor, the door Geshan connected. Large courtyard known as the habit of "rich family" and set up housing for the 5 South 5 North, 7 North South 7, 9 or even 11 large main building, is generally double courtyard, a number that is linked to the courtyard to the depth and Cheng. Many courtyards, front yard, back yard, the Eastern Hospital, West Center, is home-hospital, Kuayuan, the study hospital, the hospital room Wai, Ma, a forward, binary, three ... ... and so on. Chao Shou hospital are connected throughout the verandah, a great area.