Abstract: The subject problem is an important philosophical issue throughout the western philosophy, and the research on this issue has been continuously deepened with the development of the western philosophy. As for this question, the study has undergone the process of the subject theory of the continental rationalism represented by Descartes, who concludes that his subject is just a negative "mediator" or "bystander" that requires god to be a mediator; and the subject theory of the British empiricism represented by Locke, who pinpoints that his subject is merely a passive "reflector" in face of the known object; to Kant's critical subject, who indicates that his subject is a positive "actor" in front of the known object; and then to Gadamer's hermeneutical subject, who shows that the cognitive structure of his subject is a dynamic development structure, through the dynamic development of which the cognitive subject and object can achieve the unity. This shows the logical process of the cognitive subjectivity theory.