都城是一个王朝的政治、经济、军事和文化中心，是统治者发号施令，制定政策，实施有效统治的中枢。都城与社会的发展、王朝的兴衰有着十分密切的关系。历代统治者无不重视都城的选址和建设，把定都建都视为计及万世的“国之大事”。“食者国之宝也，兵者国之爪也，城者所以自 The capital is a dynasty’s political, economic, military and cultural center, is the ruler issued a command, make policies, the effective implementation of the central control. The capital and social development, the rise and fall of the dynasty has a very close relationship. The rulers of various dynasties paid great attention to the selection and construction of the capital and regarded the capital building in the capital as a “great event for the country” that took into account the ages. "Edible treasurer also, the pawns of the claws also, the city so from