Abstract: How to grasp the historical position of the new era and evaluate the historical contribution of the new era, in the perspective of the century-old history of the Communist Party of China (CPC), requires answers and explanations from the theoretical community. The new era is the era that has made the CPC a century-old party. The CPC is the political party with the largest number of members, the longest time in power, and the strongest ability to govern in the world. The new era is an era of building a well-off society in an all-round way as well as an era of opening a new journey of building a modern socialist country in an all-round way. The new era is an era in which the Chinese nation ushers in a great leap from standing up, getting rich to becoming strong, and it is also an era in which the sense of community of the Chinese nation has increased significantly. The new era provides new impetus, establishes new coordinates and creates new conditions for the Sinicization of Marxism, expands the space and vision of Sinicization of Marxism, and realizes the new development of Sinicization of Marxism. The new era is an era in which China makes greater contributions to mankind. The proposal of building a community with a shared future for mankind and the display of the vigor and vitality of socialism to the world provide Chinese wisdom for modernization of developing countries and reflect the internationalist responsibility and contribution of the CPC.