Abstract: With the use of the dislocation method of complex potential function, this paper studies the interaction between the interface macrocrack and the interface or beneath-interface microcracks by the construction and numerical solution of singular integral equations. The results show that the remote field phase angle ψ and Dunder′s parameter α have great influnce on the interaction between interface macrocrack and microcracks, while the effect of ψ on the shielding zone is far less than that of α.