Nanjing's Chinese gate is our country extant biggest ancient castle, for the beginning of Ming dynasty capital city's due south gate, latter said that “gathers the valuable gate”, in 1931 changed the Chinese gate. Bright Hongwu from two to eight years (A.D. from 1369 to 1375) expanded in the Nanjing Jiankang prefectural city Nanmen's foundation becomes. The Chinese gate castle thing width 118.5 meters, the north and south length 128 meters, the total area 15168 square meters, the height 20.45 meters, three enceintes of city gate link up by four arched entrances. in each gate has thousand catties floodgates which and the double fan wooden door originally high and low may start, presently only saves the floodgate trough and the gate position trace. The entire enceinte of city gate has Tibet soldier hole 27, can hide the soldier 3000 people. The enceinte of city gate both sides have the slopeway respectively, may ride a horse enters a city. This kind of Tibetan army facility, had the very vital role in the ancient times war. Meets when has the enemy storm, may the enemy soldier admit the city gate, then closes each city gate, the enemy troop truncation is three sections, divides annihilates it, resembles like “catches a turtle in a jar.” the China gate scale is huge, grand magnificent, the structure is complex, the design is ingenious, was our country ancient times the defensive construction, held the important position in the world city wall history of architecture, is listed as the state-level Cultural relic preservation organ. The Chinese gate, the bright synonym gathers the valuable gate, for the beginning of Ming dynasty capital city's due south gate, in 1931 changes to now.