A Tm-doped fiber laser based on Mach-Zehnder and FBG filter was designed,which achieved the multi-wavelength laser output around 2 μm waveband. The Mach-Zehnder filter consisted of two 3 dB couplers,and reflection wavelength of the FBG is 1950.35 nm. The wavelength interval of filter is 1.6 nm and the threshold value of laser is 70 mW. The experimental results show that the Mach-Zehnder filter combined with FBG can improve the stability of wavelength efficiently. In the experiment,laser output of single-wavelength,dual-wavelength and three-wavelength were obtained by adjusting the polarization controller. For 1892.2 nm single-wavelength laser,the wavelength drift and power shift are less than 0.6 nm and 0.969 dB,respectively,the side-mode suppression ratio is 49.75 dB；for 1902.8 nm and 1932.0 nm dual-wavelength laser,the wavelength shift are both less than 0.4 nm,the power shift are less than 1.021 dB and 2.583 dB,respectively;for 1895.7 nm,1902.5 nm and 1931.9 nm three-wavelength laser,the wavelength shift are less than 0.4 nm,0.3 nm and 1.0 nm,respectively,the power shift are less than 2.548 dB,1.441 dB and 0.809 dB,respectively. The 3 dB linewidth of output laser is less than 0.8 nm.