The crisscross of the patent system and competition policy always leads to the legal dilemma. In Taiwan, patent pool raises a new difficult era of Taiwan competition law. The Philips CD-R patent pool case judged by Taipei high administrative court seems to bring the dawn of patent pool issue because it held that ”if the patents that are being pooled are complementary, such patent pool will not constitute a concerted action.” This article argues that even if the patents that are being pooled are complementary, such patent pool might still constitute a concerted action unless it comprises essential patents.