The purpose of this study is to present selected aspects of complex issues of transformations in the public administration system of Ukraine, and changes of administrative law in the context of the European integration process. The author, on the one hand, points to new possible duties of public administration bodies created by the European integration process, and, on the other hand, raises attention to new challenges facing the public administration reform, in particular in the candidate states to the European Union, such as Ukraine. The author establishes strong links between the public administration reform and the European integration process. It is of great importance if an aspiring EU member is to prepare its administration well for the challenges of EU membership.