5. Policy implication and conclusion
Compared with similar industrial structure of industrial parks in northeastern regions in China, DETDZ is a pioneer in the field of energy saving. However, compared to other industrial parks in the developed regions like Tianjin, Guangzhou etc, it is a challenge for the DETDZ to meet similar levels of energy consumption to its nature as a heavy industrial based industrial park. For instance, in 2011, energy consumption per 10 thousand Chinese yuan GDP and water consumption per 10 thousand Chinese yuan GDP in DETDZ were lower than other regions like Northeast regions as well as lower than national average level. However, when compared to Tianjin Economic Development area (TEDA) and Guangzhou industrial park, energy consumption and water consumption for unit GDP generation were higher. The main reason of this was because the main industries in TEDA were electronic communication, vehicle equipment, medical industrial and food industry, while the industrial structure of Guangzhou industrial park was electronic communication, food industry and metal processing. Under such circumstance, DETDZ should promote the eco-industrial efficiency of its industries. DETDZ should also take advantage of its transportation advantage to establish urban symbiosis network among the adjacent regions so that much more cobenefits can be realized in a bigger area.