The application of mid-infrared laser of Directed Infrared Countermeasures (DIRCM) system in foreign countries is introduced.Based on the requirements of DIRCM system for mid-infrared laser on such indexes of laser power, beam quality, wavelength, working temperature, volume and weight, the key technologies of different types of mid-infrared lasers used in airborne DIRCM system are analyzed.The development tendency of mid-infrared laser used in airborne DIRCM system is presented in the end.