The subject of social history is the people themselves in social life, and the activities of the historical subject cannot be separated from the objects of activities, so the objects become the objects of historical activities. That is to say, in human history, all things and phenomena that are brought into the field of subject activities and have an objective relationship with subject activities are the objects of historical activities. The objects of historical activities take many forms. The first is the nature that is used and transformed by human beings. It is the initial object of human historical activities and the basic source of human material life materials. However, as a historical object, nature is no longer a free nature divorced from human society, but a "humanized nature" with social attributes marked by human beings. Secondly, people's social relations. While transforming nature, human beings have also formed certain relations of production, politics and ideology. These social relations are not only the product of the activities of the historical subject, but also the object of the transformation of the historical subject and the basic component of the historical object. Third, various spiritual and cultural phenomena. It is a reflection of human historical activities and a cultural phenomenon accumulated and preserved in the form of spiritual products, social psychology, customs and habits. Finally, man himself has become the object of subject transformation. Here, man has the duality of subject and object. While transforming the objective object, man also transforms himself, making himself develop and improve constantly. Historical objects develop with the development of historical activities, and their forms, scope, contents and levels are constantly expanding, thus making human historical activities develop in depth and breadth.