The spectral compression performance of the fundamental soliton in a dispersion-increasing fiber is investigated through numerically solving the generalized nonlinear Schrdinger equation.The influence of the input peak power on the output spectral width and the output center wavelength is analyzed,and the evolution of the pulse width,the spectral width and the chirping in the fiber are described.The calculation results show that spectral compression from 12.6 nm to 5.2 nm,i.e.spectral compression rate of 2.42,can be realized for the fundamental soliton with the pulse width of 200 fs and the center wavelength of 1 550 nm propagating in the dispersion-increasing fiber with the length of 100 m whose group-velocity dispersion parameter linearly varies from －1 ps2/km to －11 ps2/km.