Based on the nonlinear Schrdinger equation,transmission of the Gauss type chirped-pulse of nanosecond in width in single-mode fiber is discussed. The effects of aberration and nonlinear effects on both spectrum and waveform of the chirped-pulse are numerically simulated with split-step Fourier method and the contrast of the compressed pulse is analyzed in detail. The results show that for the input chirped-pulse of peak power smaller than 30 mW and of center wavelength at 1053 nm,after the transmission in 200 m single-mode fiber,the contrast of the compressed pulse is up to 1025 in 3 ps time window.