This chapter examines Supreme People’s Court (SPC)’s judicial interpretation, which has been formally legalized as a source of law for adjudication, as well as its relationship with various other statutes in China’s legislative system. It points out that the inner logic of China’s legislation with different hierarchical status, as distinct from those of democratically elected parliamentary systems, is determined by the de facto distribution of legislative power within its authoritarian regime, where the SPC has become a significant player in exercising legislative power in a way that has largely evolved beyond its constitutional settings. In particular, it investigates the unique inner logic of SPC’s judicial interpretations, which have become a de facto primary source of law for adjudication in practice.