The objective regularity of historical development means that there are certain objective laws and regularities in the process of historical development, which are objective and independent of personal will. These laws include the laws of social and economic development, class struggle and scientific and technological progress. Marxism holds that historical development has its inherent regularity, which is determined by the contradictory movement of productive forces and relations of production.

Human activities: refers to various social practice activities of human beings in historical development, including economic production, political struggle, cultural creation, etc. Human activities are an important driving force for social and historical development, and human consciousness and practical activities have an important influence and role on the historical process.

Understand the relationship between the two:

The objective laws of historical development and human activities interact and restrict each other.

Interaction: Human activities are an important driving force of historical development, and human consciousness and practical activities have a far-reaching impact on the historical process. People participate in and change the development of society through their own practical activities and promote the progress of history. At the same time, the objective regularity of historical development also affects people's activities and restricts people's choices and behaviors.

Mutual restriction: Although human activities have an important influence on historical development, to a certain extent, historical development is also restricted by objective laws. There are some objective economic, social and cultural laws in historical development, which restrict people's choice and behavior of activities and have an impact on the historical process.

Therefore, the objective laws of historical development and human activities are not isolated and antagonistic, but interact and influence each other. Human beings participate in and promote the development of history through their own practical activities, and at the same time are restricted and influenced by the objective laws of historical development.