Abstract: Strengthening the inner-Party supervision is the guarantee of comprehensively strengthening Party discipline. Since the Eighteenth National Congress of the Communist Party of China, based on the theory and practice of inner-Party supervision in the process of revolution, construction and reform, the Communist Party of China (CPC) has further strengthened the inner-Party supervision and optimized the supervision network, system and structure. Starting from its top design, the CPC strengthens the inner-party supervision by taking full advantage of traditional supervision and strengthening inspection-tour and stationed supervision; by focusing on accountability of supervision and discipline execution so as to explore new forms of effective supervision; as well as by amplifying the institution to complete laws and regulations of the inner-Party supervision. The CPC also optimizes the supervision system so as to realize the overall coverage of the inner-Party supervision by building a tight supervision network, balancing and collaborating all kinds of supervision powers, laying emphasis on the combination of the supervision both inside and outside the Party, intensifying top-down supervision, emphasizing counterparts supervision, promoting down-top supervision and transforming a full-time supervision over a point to a cooperated supervision over a scope. After four years' practice, the inner-Party supervision network has been basically constructed into an associated dynamic crisscross structure of overall coverage at all time and all levels. However, prominent problems still exist in the inner-party supervision, such as interruption of relay between each other, poor overall performance. Therefore, it is suggested that emphasis be put on playing superimposed effects of various supervision methods to realize the maximum supervision effect.