Abstract:With the rapid development of social economy in China, the water environmental pollution has become increasingly prominent. The construction of large-scale wastewater treatment plant (WWTP) can effectively solve the problem of water environmental pollution. At present, the construction type of underground WWTP is adopted frequently in the different processes and treatment scales of WWTP constructed in the different regions. Due to the large proportion of civil engineering costs in underground WWTP and the large difference in civil engineering costs among different design schemes, it is an important part of engineering investment, which must be calculated accurately and reasonably and a good job in investment control must be done. Taking a full underground WWTP project in Shanghai as an example, the calculation method and cost optimization measures of civil engineering cost of large-scale underground WWTP are discussed, which provide the reference for similar projects in the future.