In this article the author deals with the position of the principles of civil law in the current european integration processes. This topic is not only actual, but also essential according to the harmonisation efforts in the whole private law section. There are chosen parts of civil law analysed in this article from the view of the principles and their role on the european level. The author emphasises the trends to create a catalog of principles (especially in contract law), which would be useful in legal relationships with international components. In the future this catalog could also be the basic of the Code of European Private Law, about which there are already discussions among legal experts.