Abstract: By digesting the rational content of western traditional ideas of subjectivity a nd criticizing its basis of idealism, Carl Marx discovered the nature of subject ivity.His theory is characterized with the argument that the fundamental source of subjectivity stems from social practice.Reviewing the theories of the past, the author attempts at a new access to the theory of subjectivity and the relat ionship between man's subjective construction and social-economical development with the purpose of finding a new practical foundation for this theory.