Terrorism is related with trying to get a certain aim succeed by means of intimidation and force,by means of making people fear a certain actual or potential threat. The basic problem of terrorism is that it is often indiscriminate about targets. For example,if a bomb exploded in a public place,those who may die or be damaged are most of the time civilians,women,and children etc...who have no thing to do with politics. So,the effect of terrorism is harmful. That is why countries need anti-terrorism law. That is why we also have this law. So,the need for anti-terrorism law is vivid.