Along with the continual extension of the scale of power system and the growing of short-circuit current level, the application of fault current limiter is becoming more and more widespread. The problem of the role FCL plays and the specific locations in the network has become a hotspot of FCL research. In this paper, different installed positions are introduced and sorted. It also elaborates the distinguishing features of short circuit in these situations and the importance of fixing FCL. At last, the problem that needs deep consideration and research in practical application is pointed out.