Tianjin Economic-Technological Development Area, commonly abbreviated as TEDA is the main free market zone in Binhai, Tianjin, China. It was formed in late 1984. The area was created in late 1984. Since 1997, the Ministry of Commerce started a comprehensive appraisal on investment environment of all national-level development zones w…Tianjin Economic-Technological Development Area, commonly abbreviated as TEDA is the main free market zone in Binhai, Tianjin, China. It was formed in late 1984. The area was created in late 1984. Since 1997, the Ministry of Commerce started a comprehensive appraisal on investment environment of all national-level development zones which covers eight major indicators like overall economic strength, infrastructure, operation cost, human resources and supply, society and environment, facilitation for technology innovation, management system building, and development and efficiency. For 12 consecutive years, TEDA topped the list.