The characteristic of Fabry-Perot(F-P) filter which features the angle-tuning technique was illustrated in this paper and the corresponding filter that we designed was used in a erbium-doped fiber loop so as to construct a wavelength-tuning fiber laser.In the experiments,when the pump power of 980 nm laser diode(LD) reaches 30 mW,Robust single mode lasing was obtained with output power of 0.65 mW with bandwidth less than 0.1 nm.The power fluctuation of the laser is less than 1 dB and side mode suppression ratio(SMSR) is more than 35 dB at the tunable arrange of 35.76 nm.When the pump power is 46 mW,The largest output power reaches around 1 mW.