Iran was involved in various internal and external wars. Iraq's imposed war against Iran, like any other war, has features such as accelerating changes and competition in acquiring technologies. article, the performance of the Ministry of Post, Telegraph and Telephone in the specialized and general support of the war in the historical period of 1359 to 1367 is analyzed. The main method of documentary historical research and the method of analysis and interpretation is the analysis of the theme, which has been done using first and second hand documents and sources and the narration of informants about the role of post, telegraph and telephone during the imposed war. Specifically, this research focuses on the role and performance of the telecommunications company, the postal company, and the performance of the Telecommunications Research Center during the holy defense period. The results show that the telecommunication company, the degree of readiness and supplies to the fronts, the relief and rescue of the injured of the imposed war, the communication between the ranks and military and regular units, the installation and operation of the systems, infrastructures and electronic communication equipment of the holy defense, services Radar and electronic equipment, reconstruction of damaged telecommunication buildings, and telephone and telegraph communication of the fighters have had a plan and function. The Post Company has also taken actions in sending experts and volunteers to establish postal and telegraph offices to war fronts, to print sacred defense stamps, and to provide postal services to prisoners of war.