Based on analysis of the characteristics of ultrashort optical soliton, influences of third-order dispersion (TOD) and Raman scattering were taken into account. The relationships between and were obtained by using the numerical simulation method, analysis method and fitting method. It improves the self-frequency shifting formula which considered Raman scattering only. The volume of the pulse delay caused by the self-frequency shifting was also studied. The result indicates that the amount frequency shifting caused by TOD is , the amount pulse delay is , the pulse delay caused by TOD is . This result is very important for the high-speed optical switch.