Soliton self-frequency shift effect, as one of the nonlinear fiber, acts as an effective wavelength tuning method of ultrashort pulse in fiber due to its unique pulse self-holding property. The soliton self-frequency shift effect in fiber is studied from theoretical calculation and experimental verification. The simulation calculation is based on the generalized nonlinear Schrodinger equation, and the experimental analysis is performed through measuring the output spectrum of polarization-maintaining photonic crystal fiber. The experimental result is in agreement with the theoretical prediction. Both results show that the ultrashort pulse wavelength based on the soliton self-frequency shift effect can realize the continuous tuning over 300 nm in the range of fiber anomalous dispersion region.