The generation of French Deism had inevitability, not accidental. Its origin of thought and basis were the social background and theoretical background of times development, that is the development is a natural historical process. It has experienced the Renaissance, the Enlightenment, the Reformation and Sectarian strife, the rise of modern science, which formed the background of Deism thought. With the development of philosophical thought represented by Enlightenment thinker Voltaire, Montesquieu, Rousseau, in natural view the Deism has a major breakthrough for religious consciousness, they are materialist in nature. However, in the Age of Enlightenment the French religious thought has not been completely cleared in people''s minds, had to borrow the name of God to explain its natural philosophy cosmology. As intermediate links, the Deism has played a role of a bridge for the later atheism.