The invention provides a bus protection method and device with high process layer link abnormality alarm controllability. APPID numbers are ranked according to sizes and association numbers that correspond to the APPID numbers one by one and increase or decrease gradually are generated; and on the basis of the association numbers, spaced data receiving soft disk information and interval process layer link abnormality alarm messages are associated. Therefore, a problem that unified management can not be realized when exit of process layer alarm messages of an overhaul interval or vision reserve interval is carried out by setting a control word and thus the operation and maintenance workload increases can be solved; and thus the practical performance of the bus protection device is improved and the operation and operation of the substation operation become convenient.