Abstract: The theoretical change in relationship between the nation and the society, together with the theoretical development of democratic participation, provides the theoretical foundation for the authorized third party to draft a bill. The Principal-agent Theory, Transaction Costs Theory and Public Goods Theory of economics evaluate the bill-drafting by the authorized third party from the angle of economics. The rise of new public administration with theory of governance has demonstrated the advantages of governance for drafting a bill by the authorized third party. The right to draft a bill shared by private party conforms to the principle of popular sovereignty established in the Constitution. Public-private Cooperation in legislation also accords to such theories on administrative law as conversational-style administrative law and cooperative administrative law. Therefore, these theoretical analyses from different perspective justify the bill-drafting by the authorized third party and we still need to legalize the system on the basis of those practical trial and exploration.