Studies on the compressional behaviour of wool fiber mass at the dynamic compression have been carried out, and the following conclusions are derived. 1. The relationship between peak pressure and the number of repeat of dynamic compression is well fitted into the regression equation of Yp=Ap exp(BpX)＋Cp. 2. The relationship between fatigue and the number of repeat of dynamic compression is well fitted into the regression equation Yf=Af exp(BfX)＋Cf. 3. Resilience of fibre mass tested on dynamic compression maintains constant value with increased number of repeat. 4. Bent compressive curves were found on higher speed compression more than 5Hz.