Abstract: After 8 religionary wars and the promulgation of the Edict of Nantes, the religious conflicts in France in the 17th century have become assuasive, at the same time,the monarchal power have been reinforced. No mattre in the period of Louis XⅢ or the period of Louis XIV, these two bloc who control respectively the ecclesistical power and the monarchal power not only struggle for supremacy with each other but also have been interdependent. After have reviewed the literature, actually the relationship between the ecclesistical power and the monarchal power is the unity of opposites which have promoted the social revolution and have advanced the development of french society in 17th century. The analysis about the unity of opposites in the relationship between the ecclesistical power and the monarchal power can help us to know better about the social ideology of the society of France in 17th century.