Flow transferring identification is one of the necessary means to prevent unreasonable actions of remote backup protection. The principle of flow transferring identification based on wide-area information is described. The impact of fault dynamic process on flow transferring identification is analyzed. The limitations for flow transferring identification based on wide-area information are recognized. Some cases which induce non-fault transmission lines mistakenly removed are analyzed. The necessity for flow transferring identification based on local information is discussed and the direction for future research is given.