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A switchable and tunable dual-wavelength actively mode-locked fiber laser based on a dispersion tuning technique is proposed and demonstrated.Synchronous wavelength tuning of dual-wavelength operation with wavelength spacing of 22.9 nm can be achieved up to 23.2nm by changing the modulation frequency.The proposed laser can operate in dual-wavelength or single-wavelength by simple adjustment of the polarization controller.Moreover,wavelength spacing can also be varied from 22 to 45 nm at the cost of a reduced tuning range by changing the harmonic order,which is determined by the modulation frequency.These experimental observations agree well with the theoretical analysis.