Using the theory of consolidation and Boussinesq solution, the additional stress field, displacement field and over-pore-pressure field are calculated under the water-loadings for Danjiang Reservoir. The water levels are assumed to be 130m and 15km and the depth of bedrock body from reservoir bottom is 1, 3, 5, 7, 9, 11, 13 and 15 km respectively. The results show that:(1) the maximum values of σ₁, σ₃,τ_max appear at the centre of reservoir and the smaller values of σ₁,σ₃, σ_max, appear at the reservoir bank; (2) both σ₁ and σ₃ at the centre of reservoir are compressive and σ₃ near bank is tensile; (3) the maximum vertical displacement (7cm) occurs at the middle of reservoir and the maximum horizontal displacement (0.6cm) at the bank; (4) the maximum over-pore-pressure generally appears at the deepwater region of reservoir from 3km to 9km below the reservoir bottom; (5)the volume strain forms a compressive region at the centre area of reservoir, and a tensile at the bank area and expands in all directions being consistent with the distribution of epicenter of induced earthquake.