Abstract :
Homegrown terrorism and islamic radicalisation is an action that distrub the national security. Therefore, the aim of this reserch is to understand the respon of the government and what kind of approach that they use to prevent those action. For this research qualitative is be use as the methodology and the type of research is descriptive research analysis and technique collecting data of the research is library research. Concept of this research is counterterrorisn, radicalisation and the theory is the four-wave that will be futher discuss about homegrown terrorism. Homegrown terrorism is being consider danger after the murder of Theo van Gogh in Amsterdam. The reason of the murdering is because one his attainments ?the submmision?. Therefore, AIVD have role to prevent homegrown terrorism. Throug AIVD the analysis of the risk of teroris action can be able to detect before that could be seriously threat the national security.