Abstract: In the report of the 20th CPC National Congress,General Secretary Xi Jinping put forward that "the Party's self-revolution is always on the way",requiring that social revolution should always be led by the Party's self-revolution.The Party's self-revolution is an original concept in the great practice of socialism with Chinese characteristics in the new era,and it is also a major theoretical achievement of the new great project of Party construction in the new era.General Secretary Xi Jinping's important exposition on the Party's self-revolution is extremely rich,and the distinct words and profound thoughts have formed a systematic theory.With the historical theme of "taking the examination",General Secretary Xi Jinping reveals the profound thought of overcoming the spiritual slackness of the ruling Party,preventing the danger of failure in taking the examination,and jumping out of the historical cycle.With the political theme of giving full play to the advantages of Marxist political Parties,General Secretary Xi Jinping reveals the profound thought of tempering the political character of the Chinese Communists.With the practical theme of carrying out the great struggle,General Secretary Xi Jinping reveals the principle of promoting the comprehensive and strict administration of the Party in the new era.With the mission theme of "two revolutions",General Secretary Xi Jinping reveals the internal mechanism of being brave in self-revolution to lead the great social revolution.An in-depth study of the General Secretary Xi Jinping's important exposition on the Party's self-revolution is of great practical significance to the struggle in a new era and a in new journey.

Key words: Xi Jinping, self-revolution, four themes, important exposition, ideological expression