Olitical Sciences has several primary branches these are: 

1). Political Philosophy
Political philosophy is the oldest of the fields and is often referred to as normative ( how it should be ).
2). Empirical Data Analysis 
The newest area of the discipline, marked by the behaviourist attempts the theorise political behaviour 
3).Theories of the state
4).Political economy
Deals with the relationship between politics and economic processes
5).Comparative Politics
this is the study of a broad range of political activity, government and other political institutions.
6).International Relations
7).public administration