The Evolution of Beijing Industry Chain on the Perspective of the World City

According to the input-output tables of Beijing in 1997, 2002 and 2007, this paper analyzes the core industry and evolution of industry chain with the comprehensive index of net output, location quotient, influence coefficient and inducing coefficient in the construction of World City. The result shows that core industry has a certain stability and continuity. There always were computer manufacturing industry, construction industry, aviation industry, financial industry, science and technology service industry during the period of 1997-2007. Beijing's industrial chain is becoming optimized and high- end oriented. Some industries with labor- intensive, high energy consumption and high water consumption gradually withdraw from core industries because they are no longer suitable for Beijing city characters and functions, such as textile and garment industry, drink industry, steel industry. Others gradually become core industry such as knowledge intensive industry. Modern service industry chain gradually increased from 4 in 1997, 5 in 2002 and 6 in2007. Inner sections of industrial chain connect with each other more closely and professional. Financial industry chain is developing gradually to the high-end, and has transformed from steel industry to real estate, to the commercial services.Electronic information industry chain is gradually improving, and has transformed from manufacture to intensive service industry. Science and education service industry is always thought as the unique advantages of Beijing. The modern service industry with advanced, efficient and high influent is becoming more and more powerful.