The effect of the linear frequency chirp on the supercontinuum spectrum generation of Gaussian input pusle is numerically investigated in the anomalous dispersion-flatted fiber with convex dispersion profile by the split-step Fourier method.Compared with the hyperbolic secant pulse,the supercontinuum spectrum of the unchirped Gaussian pulse is wider than 200 nm,and its characteristics are better than those of the hyperbolic secant pulse.The fiber length corresponding to the best SC spectrum decreases with the increase of chirp parameter C.The characteristics of supercontinuum spectrum for negative chirp are worse than those for positive chirp,the characteristics for chirp case are worse than those for unchirped case.Near the distance of the best supercontinuum spectrum,the frequency centroid of Gaussian pulse shifts to the redshift with the increase of the chirp parameter C,and the redshift is greater than that of the hyperbolic secant pulse;the root-mean-square temporal width and spectral width of Gaussian pulse broaden with the increase of C,which are wider than those of the hyperbolic secant pulse.