In the process of social transition since the 1990s,weak group is a hot topic in the angle of social perspective and is also a focus concerned by system reform in the Sixth Plenary Mission of 16th CCCPC.The expression of the interests of the weak group is helpful to political stability and social harmony,is helpful to the equilibrium of the interests and to social development and is also helpful to realization of social fairness and justice.An effective system arrangement for weak group to get rid of the poverty is to construct effective expression mechanism of the interests of the weak group,and to make the weak group have fair expression rights and express their interests freely,rationally and legally so as to reach interests equilibrium from right equilibrium.