Abstract: As an important political judgment, the statement that "socialism with Chinese characteristics has entered a new era" has profound philosophical implications, while as a historical narrative, it can be comprehended from three historic perspectives respectively at grand, middle and basic levels. As one of important theoretical contributions of the 19^th CPC National Congress, the "four greats" based on the "new era" not only deepens the understanding of the historic mission of CPC(the Communist Party of China) but also provides important theoretical foundation for upholding and developing socialism with Chinese characteristics. As the summary of CPC's historic mission in the new era, the "four greats" embodies the general requirement of seeking happiness for people. To understand the scientific connotations and basic requirements of the "four greats" in a comprehensive and accurate manner, we should figure out the relationship between general historic mission and concrete missions at different historic stages, the relationship between China's great national rejuvenation and the historic mission of the proletariat, and other key theoretical issues. We should also pay attention to special practical issues such as establishing theoretical confidence and understanding the strategy of the "great struggle" and the foundation of the "great project" based on the new characteristics of the era.

Key words: new era, historic mission, “four greats”