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Blue-shifted dispersive waves (DWs) are effciently generated from the red-shifted solitons by coupling the 120rs pulses into the fundamental mode of the multi-knots of a photonic crystal fiber cladding.When the femtosecond pulses at the wavelength of 825nm and the average power of 300mW are coupled into knots 1-3,the conversion efficiency ηDw of 32％ and bandwidth BDw of 50nm are obtained.The ultrashort pulses generated by the DWs can be tunable over the whole visible wavelength by adjusting the wavelengths of the pump pulses coupled into different knots.It can be believed that this widely wavelength-tunable ultrashort visible pulse source has important applications in ultrafast photonics and resonant Raman scattering.