chengguanquIntroduction：Introduction to Chengguan: Chengguan District belongs to Lanzhou City, Gansu Province. It is the political, economic, cultural, scientific research, transportation and commercial center of Lanzhou City, the capital of Gansu Province. The resident population of the district is 1.28 million (2010). Chengguan District, 20.02 kilometers long from east to west, 22.6 kilometers wide from north to south, 220 square kilometers. Contains 24 streets. In 2010, the city's total production area (GDP) reached 37.688 billion yuan, an increase of 13.2% over the same period of 2009.