The Mass Line is the lifeblood of the Communist Party of China. The Communist Party of China has taken the Mass Line as the guide for all its policies since its inception. The advancement of times has brought about profound changes to the conditions of the Communist Party of China, the nation and the world. In the face of the new environment and situation, the Mass Line of the Communist Party of China needs to be "modernized". From the perspective of structure, it is the organic unity of ideological concept, practical form and discourse system; from the perspective of value function, it is the driving force, guarantee and logical premise of the Party’s own development, social development and national development; from the perspective of orientation, it contains the logical purpose and development direction to seek truth, progress and innovation. At this new juncture of history, the questions of why and how to promote the modernization of the Mass Line of the Communist Party of China should be explored in terms of connotation, value and orientation, in order to inherit this great practice from the past and develop it into the future.