This is about the law of reflective in the thoughts of Jurgen Habermas. A deliberative democracy and a law of positivism are legitimate for consensus of the society, economy, and the nation. Utilizing his idea on a deliberative democracy, Habermas answers the unsolved problems posed by the ideology critiques on the instrumental rationality used by the Western constitution systems. His theory may also be applied to establish democracy within the Eastern values of the Asian societies, like Indonesia, which uses certain traditional values in the systems of the constitution.