After a major overhaul rendered in 2003 to the Taiwan's Patent Law, scholars continue to discuss whether our patent system is properly functioning, wherein the patent revocation system has been one of these areas being reviewed. This article seeks to address the need of another overhaul of the current revocation system, along with suggestion of adoption of post-grant opposition system as a supplement to current system, thus that we would be able to approach toward the global patent law harmonization. In this article, Part II identifies current trend of said harmonization of global patent laws, Part III provides a review of the development of revocation system in the Patent Law, followed by Part IV which addresses current post-grant revocation system in the Patent Law, Specifically, it diagnoses grounds for revocation, threshold of revocation, ex parte and inter partes, expert panel for revocation and appeal, broadest reasonable claim and presumption of validity, res judicata, and bifurcating legal system. Part V provides a proposal to harmonizing Taiwan's patent revocation system by adding curative measures to current revocation system and adopting post-grant opposition for future revocation system. Finally, Part VI offers a conclusion.