In order to promote the development of airborne high energy laser weapon,key technologies in the construction of a test machine for high energy laser systems is studied.The role and status of the flight test airplane in the field of aviation science and technology is studied,and illustrated with the typical US X test aircraft,the F22 and the F35 avionics.The importance and necessity of testing machines in the development of airborne high energy lasers is explained and the characteristics of the construction of airborne high energy laser weapons in the United States,the former Soviet Union and Israel,including those that have been flown and those that are planned,are analyzed respectively.Overall analyses of the key technical points in the construction of the test machine are conducted such as key technology identification,technology maturity analysis,test machine design,test machine modification and test documentation.