Abstract: The identification and recognization of textile fibers by using differ- ential scanning calorimetry (DSC) technique is deteiled.In this study we mainly applied the DSC to identify the fibers dyed with a type of dye in different concertration and identify a kind of dye in different type.The results are showed that:a,the DSG method can be used to identify the dyes in the same or similar colour but in different types,bs the DSC curves of dyed fibers appeared not only the fibers special peaks but also the new special peak that dyes act on fibers.