Building a world-class urban agglomeration in Beijing-Tianjin-Hebei is one of the important goals of the coordinated development of Beijing-Tianjin-Hebei. However，the construction of metropolitan area is a necessary stage for the formation of urban agglomeration. The capital metropolitan area must be the metropolitan area with the highest economic energy level，the strongest radiation ability and the most influential world in the Beijing-Tianjin-Hebei region. It has played a practical leading and exemplary role to development and construction of the Beijing-Tianjin-Hebei region. Since the Beijing-Tianjin-Hebei coordinated development strategy has become a national strategy，some important progress has been made in the construction of the capital metropolitan area，which is reflected to varying degrees in four aspects：economic development，population agglomeration，transportation infrastructure，and public services. However，it is inevitable that in order to promote the better development of the capital metropolitan area，there are still problems such as insufficient complementarity of industrial development，insufficient supporting development of transportation system construction，defects in urban system construction，and insufficient public service supply capacity. It is suggested that in the future development，the regional planning of the capital metropolitan area should be promoted as soon as possible，the top-level institutional design of the capital metropolitan area should be accelerated，the construction of transportation infrastructure should be strengthened，and the layout of high-quality public services should be improved.