Tianjin and Community of Madrid are friendly associated on April, 7th,  in 1997.

The Community of Madrid is one of the seventeen autonomous communities of Spain. It is located at the center of the country, the Iberian peninsula, and the Meseta Central or Central Plain. The community is also conterminous with the province of Madrid and contains the capital of Spain, which is also the capital of the community. It is bounded to the south and east by Castile-La Mancha and to the north and west by Castile and Le¨®n. It has an estimated population of 6,251,876£¨2008£©, mostly concentrated at the metropolitan area of Madrid. The total area of Madrid Community is 8,030.1km2.

The Community of Madrid is the autonomous community with the second highest income per capita in Spain at €31,110 in 2008, significantly above the national average, behind of the Basque Country (32.133)and ahead of Navarra (30,614), and Catalonia (30,124).In 2005, the Community of Madrid was the main receptor of foreign investment in the country, at 34.3% of the total. In spite of that, the community ranks 34th amongst all European regions (evaluated in 2002), and 50th amongst the most competitive cities-regions in the planet.Nonetheless, it is still ahead of Barcelona and Valencia, the other two largest metropolitan areas of Spain. The strengths of the economy of the community are its low unemployment rate, its high investment in research, its relatively high development, and the added-value services therein performed. Its weaknesses include the low penetration of broadband and new technologies of information and an unequal male to female occupation.

The service, construction, and industry sectors are prominent in Madrid¡¯s commercial productive structure. According to the Directorio Central de Empresas (Central Companies Directory of the INE), Madrid¡¯s active businesses stand in third place nationally in terms of numbers as at 1 January 2006. The branches of activity with most active businesses are other business activities, retail trade, construction, wholesale trade, hospitality, property activities, land transport, and pipeline transport. Madrid¡¯s levels of industry set it at fourth place in Spain. The following areas predominate in terms of business numbers: publishing and graphic arts, manufacture of metal products (except machinery and equipment), manufacture of furniture and other manufacturing industries, wearing apparel and fur industry, and food product industry. The province also boasts a higher concentration of high and medium technology activities and services than the rest of Spain. This is the case in the following areas: manufacture of office machinery and IT equipment; manufacture of electronic products, manufacture of radio equipment, and devices; manufacture of medical and surgical, precision, optical and timekeeping equipment and instruments; post and telecommunications; IT activities; and research and development.