Democracy involves political equality and autonomy, and nomocracy is a kind of legal governance and faith in rule. Only democracy is institutionalized can one have nomocracy, and the premise of nomocracy is democracy. The anarchy of international society requires that international democracy and nomocracy needs international cooperation, however, being interdependent and struggling, the “binary structure” of sovereignty and hegemony has restrained the development of international democracy, nomocracy and cooperation. Under the condition of globalization, the rise of emerging powers, the acceleration of internationally social transformation, and the increase of peoples common interests have helped to promote the international democracy, nomocracy and cooperation, which will facilitate to safeguard the stably international order and develop peacefully among the countries.