Abstract: To promote the application and popularization of spectrum-fingerprint anti-counterfeiting fiber, in this paper, 9 kinds of fiber samples were prepared and the anti-counterfeiting characteristics of the fiber were studied with the help of fluorescence spectrophotometer. The results showed that spectrum-fingerprint fibers made by different raw materials and spinning process parameters had different emission spectra when excited with specific exciting light, which were unique, just like the fingerprint of human beings. The emission spectral curve of spectrum-fingerprint fiber had excellent reproducibility after repeated measurement and had no observable change happening after being stored for 6months, washed for 2hours, light for 5hours or being treated for 2hours by 120℃ tempreture, acide or base for 2minutes. But the emission intensity decreased by 0.7% after being stored for 12months and by over 10% after being treated by acide or base for 5minutes，meanwhile the emission wavelength had no change. Therefore the fiber should be stored in a dry environment and prolonged treatment should be avoided in application.

Key words: anti-counterfeiting, fiber, anti-counterfeiting characteristic, rare earth