The general principles of the civil law have already ruled right subject of real estate of natural person and legal person as civil subject. The general rules of the civil law and the civil code not only have clarified profit legal person and non-profit legal person, but also accepted organization without legal personality as third civil subject. In this research paper, I have first given an overview of legal structure of natural person, legal person and organization without legal personality in the civil code, and then clarified the diversification of right subject of real estate as civil subject in comparison with the general principles of the civil law.