Constructing electromagnetic environment for airborne equipment is one of the most important basic conditions in the process of its airworthiness. The requirement of the constructing electromagnetic environment is deduced with DO160,which is suggested by some airworthiness documents. Four typical constructing methods, objects and elements are given to test the electromagnetic environment airworthiness of airborne equipment. The construction method of the digital simulation is mainly shown to establish the airworthiness test’s electromagnetic environment for the airborne equipments.