Abstract: Acoustic emission can be applied for composites sheet damage detection because of its being sensitive to the defects generation and expansion, and damage location is the key technology in acoustic emission. This paper provided an acoustic emission detection system combined with optical fiber sensing technology, identified the location of damage sources in composites sheets. The distributed optical fiber sensors were arranged on the top of composites sheet based on triangulation principle to detect damage signals. Then, Daubechies10 wavelet and Gabor wavelet were used to denoising and acquire signal peak to obtain the propagation time of Lamb mode(A0). Finally, the location of destructive source was obtained by computing for non-linear equations, which were established by the time of arrivals based on triangulation. This method had the advantage over other methods, such as non-contact and no use of material parameters. It was an important method to detect composites sheet damage.