While recent revisions of Taiwan's Patent Act and Trademark Act have witnessed many radical changes in its substantive regulations, the post-issuance procedures remains basically unchanged. The results are not only that Taiwan own distinctively unique post-issuance procedures compared to their counterparts in other countries, but also that they caused many difficult theoretical and practical legal problems. This Article tries to explore those problems and offer some tentative resolutions. The aim is to structure a more theoretically logical and practically enforceable post-issuance systems for Taiwan's Patent Act and Trademark Act.