AES(Airborne electronic suits)are carried in certain structures of military aircrafts, which contribute the relevant EMP／EMH(Electromagnetic Protection／Electromagnetic Hardening) characteristics for the AES. For military aircrafts, the EMP／EMH characteristics of aircraft structures have a great impact on the AES, so the EMP／EMH characteristics of aircraft structures is one of the important parts of its operational integrity. The EMP／EMH concept is attributed from perspectives of both EMC(Electro-Magnetic Compatibility) and the EW(Electromagnetic Warfare), which is followed the concept of electromagnetic hardening or reinforcement. The EMP／EMH of aircraft structures is combined engineering technology and operational tasks. Several typical EMP／EMH measures of aircraft structures are proposed based on the analysis of typical electromagnetic threats, the EMP／EMH characteristics of aircraft structure and the electromagnetic damage mechanism ware analyzed from aircraft structure, which was in order to improve the operational integrity of AES.