In these days, recognition of security threats, generally known as intrusion, has turned into a really crucial and critical problem in system, information and data security. Thus, an Intrusion Detection System (IDS) has turned into a really necessary portion in network or computer security. Elimination of such intrusions totally is dependent upon on detection convenience of Intrusion Detection System (IDS). As system rate becomes faster, there is an arise importance of IDS to be light with higher detection rates. Thus, several feature selection approaches/methods are planned in the literature.