Aiming at low speed impact load positioning,an impac t localization algorithm based on time-difference identification is presented.Firstly,Teager energy operator is used to process th e response signal for improving time resolution capability.Then, the impact area location method based on dichotomy of time-difference and impac t coordinate calculation method based on time-difference curve fitting are suggested.Finally,by building an impact moni toring system of wing model based on distributed optical fiber,regional identif ication and accurate coordinates prediction of impact loa d are realized respectively.The results show that for 5random impact points on the 120cm-long high aspect ratio wings model,all area s of impact points can be identified correctly, and the average error of coordinates identification is 8.4cm.The method can ef fectively realize the impact load location identification by using 5fiber Bragg grating (FBG) sensors and a low sampling r ate FBG signal acquisition system,and it has merits,such as simple monitoring network,fast identification capability and high parcticability.