Abstract: According to elastoplastic damage deformation mechanism of jointed rockmass, a 3 D elastoplastic damage constitutive model for intermittent multi joints rockmass under initial damage, damage evolution and plastic damage deformation state is established in this paper. On the basis of this constitutive model, a cylindrical damage rock bolt element model (CDRB element model) is proposed to simulate the reinforcing effect of bolts in intermittent jointed rockmass. Finally, the proposed models have been applied to the stability analysis of the high slope of Three Gorges Shiplock under construction. The 3 D non linear FEM analysis of the bolted slope rockmass gives satisfactory results.