Emergency dedicated Digital trunking (ePDT) communication system is designed to meet the needs of fast response, efficient scheduling and reliable transmission of emergency communication。The system combines the advantages of digital communication technology and cluster communication, and can realize real-time transmission and sharing of voice, data, image and other information in emergency scenarios。In order to standardize the construction and use of the emergency special Digital Cluster (ePDT) communication system, the Department of Science, Technology and Information Technology of the Ministry of Emergency Management organized the drafting of the Technical Specification for Emergency Special Digital Cluster (ePDT) Communication System and other relevant standards。