By using the complex variable method, the electro-elastic interaction between a piezoelectric screw dislocation in the infinite half-plane and a semi-elliptical interface crack under remote anti-plane shear stresses and in-plane electric loads in piezoelectric bi-material is investigated, and the general solutions to the problem are obtained. The complex potentials, the generalized stress fields, the generalized stress intensity factors and energy release rate of crack tip, and the image force acting on the dislocation are also calculated. The influences of the electro-elastic constants and th...