A novel tunable Fabry-Perot (F-P) filter was developed to meet the requirement of high power tunable fiber lasers.It consisted of two fiber collimators,a cavity length tunable F-P cavity and a piezoelectric transducer (PZT).By changing the voltage applied to PZT,the length of F-P cavity could be tuned finely.A wide tunable wavelength range of 50 nm was achieved with a fineness of 134.The developed F-P tunable filter was used to construct a ring-shaped tunable Yb fiber laser,using Yb³⁺-doped fiber as the gain media.A tunable range of 32.5 nm was realized for the laser output,covering the wavelength between 1032.82 and 1065.32 nm.The maximum output power of laser was 2.72 mW with a linewidth of 0.078 nm.