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In order to improve the signal-to-noise ratio of an all-fiber front-end system for high-energy pete-wattilW)laser devices, we propose a method to restrain the noise by optical Kerr effect.In terms of analytical calculation,it is found that the signal-to-noise ratio can be increased by three orders of magnitude with the cell of pulse cleaning for the pulses, with the full width at half maximum TFWHM larger than 100ps.However, numerical calculation indicates that the group-velocity dispersion(GVD)may have a marked effect on the pulses with TFWHM smaller than 100 ps but larger than 5ps, with the help of self-phase modulation(SPM).This would debase the performance of the cell of pulse cleaning.Meanwhile, we study the methods of restraining the distortion for the pulses with different peak powers to improve the performance of an all-fiber front-end system for high-energy PW laser devices, These results are of benefit to the experiments and the improvement of signal-to-noise ratio for high-energy PW laser devices.