Abstract: A kind of all-fiber chirped pulse amplification system is proposed. On the basis of theoretical analysis, the nonlinear Schrödinger Equation is solved by using the distribution of Fourier method. Two all-fiber chirped pulse amplification systems based on combination of A（1 m-DCF+2 m-EDF+3.08 m-SMF）and combination of B（1 m-DCF+2 m-LMA-EDF+0.61 m-SMF）are segmented and numerically simulated, respectively. The results show that, after amplification system consisting of combination A, seed pulse with repetition rate 100 MHz, peak power 33.3W and pulse width 300 fs, becomes pulse with repetition rate 100 MHz, peak power 18 062.43 W and pulse width about 56 fs. But after amplification system consisting of combination B, the seed pulse becomes pulse with repetition rate 100 MHz, peak power 31 022.24 W and pulse width about 50 fs.