中国特色社会主义进入新时代"作为一个重大政治判断，有其深刻思想底蕴；作为历史叙事，可以从大、中、小三个层面的历史观加以理解。基于"新时代"进而提出"四个伟大"，不仅深化了对党的历史使命的认识，也为新时代坚持和发展中国特色社会主义提供了重要理论基础，因而是十九大报告的重要理论贡献之一。"四个伟大"作为新时代中国共产党历史使命的概括，体现了为人民谋幸福的总要求。全面准确理解"四个伟大"的科学内涵和基本要求，既要注意厘清党的总的历史使命与不同历史阶段的使命、中华民族伟大复兴与无产阶级历史使命的关系等重大理论问题，也要充分注意从时代的新特点来认识"伟大斗争"之策略、"伟大工程"之根基以及理论自信之确立等具体现实问题。

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.