The current Chinese foreign and national security system suffers from problems of inefficiency, a lack of coordination and information sharing, and accountability of decision makers. China's newly established Central National Security Commission (CNSC) is designed to build a strong platform to coordinate national security work and to strengthen unified leadership of national security at the central level. This article examines the CNSC's foreign policy and institutional rationales. It argues that the establishment of the CNSC must be viewed in light of China's growing power and Xi's aspiration to play 'big power diplomacy' in world affairs as well as his ambition for overall institutional reforms of foreign and national security policymaking in China.