This article is the study of epoxy resin modified, in the use of IPN, montmorillonite modified epoxy resin, the application of the epoxy to epoxy potting compound, the solution Brittle epoxy potting material, easy to crack, and other issues. First of all IPN on a modified epoxy resin, followed by use of MMT and epoxy resin organic integration, adding microsilica filled, the last to join the promotion of and thinner. The results showed that the epoxy resin and the compatibility of montmorillonite good mechanical properties, heat resistance have different levels of advancement and improvement. Finally, the use of modified after the preparation of a new type of epoxy resin epoxy potting material, and its main targets were studied. The results show that toughness and weatherability has been significantly improved; encapsulating materials used and new car ignition coil, achieved very good results.