To impart self-healing ability to epoxy, styrene-and benzoyl peroxide (BPO)-loaded microcapsules were prepared by in-situ polymerization in emulsion using melamine-formaldehyde resin as the wall former. Afterwards, the two types of microcapsules were embedded in epoxy producing self-healing epoxy composite. Upon fracture of the material, the core substances in the broken capsules were released and polymerization of styrene initiated by BPO took place, rebonding the cracked planes. Parameters for manufacturing the microcapsules and the factors that influence healing efficiency of the system were discussed in detail.