Blu-ray Disc (BD), the next generation in optical discs, offers clearer and sharper image, better sound quality than DVD. In 2013, more than 72 million households have BD compatible devices in U.S. This paper aims to explore objectively key technology fields and intellectual intelligence of this emerging BD technology for participants. The patent co-citation approach (PCA), a patent classification system that is adaptive to the characteristics of a specific industry, is applied to draw key technology fields of BD technology. The results show that BD patents can be classified into eight technological categories. Most patents are classified into the two factors – factor 1.1 recording medium, recording and reproducing process, and factor 1.2 information recording medium, defect management. The intelligence can benefit patent management to make technological forecasting, research planning, and technological positioning for BD technology.