Effect of initial chirp on femtosecond optical soliton time characters and spectrums has been studied by analyzing second-order and fundamental femtosecond soliton transmission numerically by use of the split-step Fourier method. We show that initial chirp, which can greatly effect the main spectral lines' redshift, consequently, can greatly effect the soliton retardation caused by Raman effect. The femtosecond soliton retardation is strengthened by positive initial chirp but decreased by negative initial chirp.