Tm-doped fiber lasers have a huge applied prospect because of their emitting wavelength about 2 μm in the absorption of water molecules, eye safety and being considered to be effective pump sources for 3~5 μm optical parametric oscillator. This paper launches a series of studies on continuous wave laser, pulsed laser and tunable laser with imported and domestic Tm-doped double-clad fibers. Spectral characteristics of imported fiber are studied, with the maximum output power of 6 W and the slope efficiency of 50% for continuous-wave (CW) operation. For domestic fiber, the maximum output power is 5.1 W and the slope efficiency is 41.9%. A back-Littrow configuration is adopted with a blazed grating as a frequency selecting component. The maximum tunable range reaches 105 nm, and the linewidth of each laser spectrum is about 2.2 nm in the tunable range. A Q-switched fiber laser with an acousto-optic modulator (AOM) is also reported. The laser generates pulses of 200 ns duration with 840 μJ pulse energy, corresponding to the peak power of 4.2 kW when the repetition rate is 1 kHz. The shortest duration of 180 ns is obtained with the repetition rate being 3 kHz. Laser diode (LD) double-end pumped Tm-doped fiber laser is also studied. The effect of fiber length and transmission of output mirror on output power is analyzed. A red shift in the wavelength of the output with the increase of the pump power is also discussed.