Creation of repeatable healing function is one of the main topics in self-healing materials. As a solution of this problem, we proposed the introduction of micro-channels on the surface of microcapsules as self-healing medium. Here, the micro-channels must be opened by tensile stress induced by micro-cracks and the healing agent as core material of microcapsules will be repeatedly leaked from opened microcapsules. In this study, the method to apply channels to microcapsules was investigated utilizing the removal of secondary phase in membrane. Here, magnetic particles and biodegradable resin were used as secondary phase. Magnetic particles treaded with release agent could be removed from membrane of microcapsules. In addition, core material could be repeatedly leaked through the hole generated by removal of magnetic particles by applying compressive force to microcapsule. The generation of hole could not be successful by hydrolysis of biodegradable rest as secondary phase. However, biodegradable resin weaken by hydrolysis could be broken by applying compressive force to microcapsule, resulting in repeated leakage of core material. These results indicate that the removal of secondary phase is one of sufficient methods to apply channels to microcapsules for self-healing materials.