The rapid development of infrared precision guided technology has led to a rapid decline in the countermeasure effectiveness of traditional infrared decoys,infrared omnidirectional jamming and other protective measures.The directional infrared countermeasures system only radiates laser during interference,with narrow beam,concentrated energy,no need for heating,and strong concealment and timeliness,which is the mainstream platform for dealing with infrared precision guided strikescurrently.As a core component of directional infrared countermeasures system,laser source plays a significant role in jamming efficiency and has been receiving much attention.The research progress of six types of laser sources,such as quantum cascade lasers,which can be used in directional infrared countermeasure systems,is introduced,and an outlook on the future trend of directional infrared countermeasure systems is given in the light of the integration,stability and adaptability of laser sources.