Abstract: The ground deformation in Daqing City falls into two categories: land uplift and land subsidence.On the basis of the characteristics of ground deformation,the relationship between the uplift deformation and water injection pressure is demonstrated by the analysis on the characteristics of the time and space distribution of the casing damage wells,which leads to the conclusion that water injection under high pressure is the main cause for the deformation of land uplift and the groundwater drawdown for the deformation of land subsidence.The achievements in this paper provide valuable reference to the effective control of the pressure balance between the underground layers and the change of the groundwater level and the avoidance of the ground deformation and its harms in the future exploitation of the oilfield.