In order to extend the investigation addressed in Part I of this series to treat the multi-cracks problem in a finite brittle solid, this paper deals with the M-integral analysis for microcrack damage in the brittle phase of a metal/ceramic bimaterial. The basic idea is based on such a concept that the outside boundaries of the finite solid could be considered as a special kind of interface between air and the solid or between a rigid body and the solid. Following the work did by Zhao and Chen (Archive of Applied Mechanics 67, 393–406), who have found the contribution induced from the interface of the bimaterial to the J 2-integral, the first task of this paper is to reexamine the conservation laws of the J k -vector in the interaction problem among the interface and multi-subinterface microcracks. Unlike the conclusion given in Part I, the vanishing nature of both components of the J k -integral vector at infinity should include the contribution arising from the interface (as another kind of discontinuity). Only after clarifying this contribution, could new formulations of the conservation laws of the vector be deduced. This will lead to a correct way, from which the extension of the present investigation to treat a finite solid could be performed. Furthermore, the second task of this paper is aimed at providing a fundamental understanding of the interaction effect and the coalescence tendency for the microcracks based on the M-integral analysis as influenced by the existence of the ductile phase. Numerical results are given for the Cu/Al 2O 3 and the Ni/MgO bimaterial solids. It is concluded that the M-integral actually plays an important role for microcrack damage in the brittle phase of the bimaterial solids, which could be considered as a measure of the damage level and the coalescence tendency among the microcracks. It is concluded also that for a certain microcrack array the value of the M-integral in metal/ceramic bimaterial solids is always larger than that in homogeneous brittle solids. This means that the same microcrack array in the former cases shows lower stability and larger coalescence tendency than that in the later cases due to the existence of the ductile phase or due to the interaction of the microcrack array with the interface. Of great interest is that the divergencies of the M-integral values in bimaterials from those for the same microcrack array in homogeneous brittle solids are dominated by the first Dundurs parameter with no regards to the second Dundurs parameter. Finally, an extension of this investigation to treat microcrack damage in a half plane brittle solid is discussed briefly to show the potential applications of the M-integral analysis.