A novel tunable microwave photonic filter (MPF) implemented by two tu nable laser sources and dual-phase-shifted fiber Bragg grating (DPS-FBG) is proposed and experime ntally demonstrated in this paper.In the proposed MPF,the two laser sources are modulated by sweeping microwave signals through a phase modulator.One of the sideband of each optical modulated signal is suppressed by each ultra-narrow notch of the DPS-FBG in reflection spectrum,and the phase-modul ation to intensity-modulation conversion is performed.By tuning the wavelengths of the two tunable laser sources to increase spectral interval,the switchability between the single-pas sband filter and the dual-passband filter can be achieved,and the 3-dB bandwidth of the single-pa ss band filter can be tuned. By tuning the wavelengths simultaneously in the same direction by a same ste p,the frequencies of the dual-passband filter can be simultaneously tuned with the frequency interva l maintained.Furthermore, by tuning one wavelength with the other fixed,one passband can be tuned while t he other passband filter is fixed.A theoretical model is established and corresponding simul ation is performed,which is verified by an experiment.In the experiment,the 3dB bandwidth of MPF increases from 180M Hz to 319MHz,and the frequency tuning range from 1GHz to 7GHz is obtained.