Abstract: The Protestant Reformation was another wave of thought liberation movement after the Renaissance,during which the power of bourgeois was rising.The Protestant Reformation gave a huge promoting force to the development of the western European society,triggered the change of ideas and laid the foundation for the social transformation.Fundamentally speaking,the Protestant Reformation was a kind of political transformation launched by the newly rising bourgeois against feudalism in the name of religious movement.The Protestant Reformation promoted the formulation and development of the key elements of capitalist democracy form the perspective of the change of ideas and its role in the social development.