The interaction effect between circular imperfect interface with cracks and piezoelectric screw dislocation located inside matrix under antiplane shear and plane electric fields in infinity is investigated. Using Riemann-Schwarz's symmetry principle integrated with the analysis singularity of complex functions，the closed form solutions for complex potentials of this problem is presented. The generalized stress fields and displacement fields in matrix and inhmogeneity regions are also given out. By using the Peach-Koehler formula，the image force acting on the screw dislocation is calculated. The influence of the cracks, imperfect interface and the materials constants on the image force are discussed. The results indicate the influence of the crack and the imperfect interface on the image force and the equilibrium position of the dislocation near the inhomogeneity are significant.