６月５日，国家经贸委５５０号文，将银川等１０个省会城市列入限时禁止使用实心黏土砖的大中城市名单，这给银川市的墙改工作带来了新的机遇，同时地提出了更高的要求。 银川是宁夏回族自治区的首府；人均占有耕地只有１．３３苗，低于全国人均１．５１的水平，可耕地资源有限 On June 5, State Economic and Trade Commission No. 550 issued a list of 10 capital cities, including Yinchuan, to large and medium-sized cities that banning the use of solid clay bricks for a time. This brought new opportunities to the wall reform work in Yinchuan City, Put forward higher requirements. Yinchuan is the capital of Ningxia Hui Autonomous Region; the per capita arable land is only 1.33 mu, which is lower than the national average of 1.51 and the arable land is limited