The subject of the present research is a formalized descriptive model of the interaction between electromagnetic radiation (EMR) with ultrashort pulse duration (UPD) and weak ionized air, and forming of the high-conductivity state in the discharge gap. The aim of the paper is to work out a description of the interaction between EMR UPD and weak ionized air and forming of a high-conductivity state in the discharge gap.The objectives of the article can be stated as follows: to analyze the well-known scientific results in the sphere of developing and investigating the materials and media with the use of plasma technologies, and their interaction with EMR UPD, to analyze the process of the EMR UPD reflection from artificially created high-conductivity channels in the constructive holes and cable channels of the input of corps-screens; to develop a system of physical model for the constructive holes and cable channels' input protection, taking into account the hole air state's change under the influence of a radioisotope source, electromagnetic wave (EMW) and EMR UPD; to work out a formalized descriptive model of the interaction between EMR UPD and weak ionized air, and formation of a high-conductivity state in the discharge gap.The results of the research are as follows: in the article has been suggested the descriptive model of the interaction between EMR UPD and weak ionized air, and the formation of a high-conductivity state in the discharge gap. The novelty of the research lies in taking into account the physical processes on the initial plasma, plasma-living and plasma-stripped stages, which influence the change of the hole air's conductivity state, and are determined by the time and energetic conditions of high-conductivity channel's formation in the hole air of cops-screens, cable channels of the radio electronic means' (REM) input on the condition of interaction between EMR UPD and weak ionized air, depending on the intensity of a source of ionization, EMR parameters, and also the value of athmospheric pressure lead to the evolution of EMR impulse. Findings of the reseach: the suggested solution gives the opportunity to assert the emergence of a guaranteed highly conductive channel to carry out a circuit of RMR in a hole (gap) and the prevention of further penetration and distructive impact on REM.

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