In order to realize the automatic recognition of distribution terminal,the cancellation model of the distribution terminal is put forword based on the find / registration model.The Check/Request model is put forword in the analysis of several possible breakdowns of the distribution terminal.The distribution master station can confirm whether the terminal needs to be cancelled through the Check command,and the distribution terminals request to exit the system through the Request command.The Check/Request model,which is expressed by the abstract syntax notation (ASN.1),is mapped to the IP network by the user datagram protocol (UDP).The experiment proved that Check/Request model can quickly identify the fault terminal and processing.