Abstract: The Daqing oilfield in Songliao Basin is one of the major oil and gas production bases of China, with abundant oil and gas resources as well as groundwater and geothermal resources. After more than half a century of sustained development and construction, Daqing oilfield has entered the middle and late stage of development. The comprehensive water content of the oilfield is up to 90% and more. Due to the development and construction of high strength, the geological environment of the oilfield is badly affected, specifically in the following aspects: 1) pollution of aquifer environment; 2) pollution of soil environment; 3) influence on the original pressure of strata; 4) ground uplift and subsidence; and 5) destruction of geothermal reservoir and geothermal resources. It should be paid great attention to immediately carry out investigation, evaluation, monitoring and research work and take countermeasures.