Since the 18th National Congress of the Communist Party of China, discursive expression in the field of Party building has become increasingly rich, giving rise to the discourse system of Party building in the new era and manifesting the rich implications of Xi Jinping Thought on Party Building. According to differing criteria such as content composition, functional orientation, and field of action, the discourse system of Party building in the new era presents a composite configuration across three dimensions: a concentriccircle structure composed of inner core discourse clusters, intermediate basic discourse clusters, and peripheral specific discourse clusters; a supporting matrix made up of theoretical discourse, practical discourse, institutional discourse, and value discourse; and an expressive system formed by political discourse, academic discourse, and popular discourse. In the course of its operation, the discourse system of Party building in the new era takes discourse production as its starting point, discourse dissemination as its intermediary, and discourse identification as its destination, forming a dynamic cycle of generation, diffusion, internalization, and reproduction, and, on this basis, brings into play its overall efficacy in knowledge provision, theoretical identification, practical guidance, independent interpretation, and cultural nurturing.