High performance epoxy systems have been widely used in electronic devices, aerospace structures, and automotive parts. In this study, introduction of both core-shell rubber (CSR) and thermoplastics into epoxy systems was considered to improve mechanical properties as well as to make tack-free surfaced epoxy films. CSR particles were very uniformly dispersed into epoxy by means of ultrasonic dismembrator and homogenizer at the presence of polymeric dispersion agent. Well-dispersed CSR containing epoxy systems exhibited higher peel strengths at room temperature. Furthermore, peel strength as well as impact peel strength at low temperature could be comprehensively improved.