Tianjin and Gyeonggi-do are friendly associated on March, 28th,  in 2008.

Gyeonggi-do is the most populous province in South Korea, where  Seoul—South Korea's largest city and national capital is located in the heart. Besides,  Incheon—South Korea's third largest city—is located on the coast of the province. Gyeonggi-do is a politically important area of 10，131km² with a population of 10,415,399 (2005).

As the backbone of Seoul in the means of manufacturing complex, Gyeonggi-do is evenly developed in various industries such as heavy industry (electronics, machine, heavy and chemical industry, steel), light industry (textile), and farm, livestock and fisheries industry. Due to the influence of recent high wages, the weight of various manufacturing industries has decreased in Korea’s economy. Gyeonggi-do  is also making efforts in many ways to improve and modernize the conventional industry structure. It is unsparingly investing in the promotion of service industries related to soft competitive power such as state-of-the-art IT industry, designing, conventions and tourism, along with its great leap as a commercial hub in Northeast Asia using the Pyeongtaek Harbor. Besides this, it is famous for its special local products such as Icheon rice and Icheon/Gwangju ceramics. Also, the manufacturing base of global IT industries that represent Korea, such as Suwon Samsung Semi-conductor, Paju LG LCD Complex, and Icheon Hynix are located in Gyeonggi Province. Yeolmae Food also has its headquarters here.

Gyeonggi-do is extremely well-developed in international aerial transportation. It is nearby Incheon International Airport, said to be the gateway to Korea, with the 2nd international airport of Gimpo International Airport situated within the provinve. The area is cut through by the Gyeongin Line, Korea’s first railroad, and the Gyeongin Expressway, Korea’s first expressway. The usage of sea transportation utilizing Pyeongtaek Harbor is high, and this is due to the fact that nearby regions including Seoul are playing an important role as the door to trade and commerce along with imports and exports.