Heat seeking weapons such as man-portable air defense system (MANPADs), various IR guiding missile are the main threaten for civil aircraft and military aircraft. As the appearance of IR imaging seeker, the effect of traditional IR interference equipment and infrared flares are limited. Otherwise, direct IR countermeasure (DIRCM) system has been effective means. In this paper, the international research on DIRCM and key techniques for laser of DIRCM was reviewed. Furthermore, calculating method for dazzling area of imaging detector was given. At the same time, the research trends of DIRCM and laser of DIRCM were forecasted in the future.