The solid state lasers with high power and high beam quality at 2 μm band have important applica.tions in laser medical treatment, remote sensing, high precision spectral measurement and military. Compared with traditional doped laser crystal such as YAG, YLF and YAP, Tm doped laser crystal such as Y2O3, Lu2O3 and Sc2O3 has the advantages of low phonon energy, high thermal conductivity and wide spectral range. A high efficiency con. tinuous wave Tm:Y2O3mid-infrared solid laser is reported. Using 1 678 nm Er-doped Raman fiber laser as pump source, the highest slope efficiency of 63.3% is obtained. The maximum output power of the laser is 0.4 W, and the central wavelength is located at 2 051 nm. In addition, the beam quality factors in the horizontal and vertical direc.tions under the maximum output power are estimated to be 1.2 and 1.1 respectively. Finally, the future technologi.cal development of doped Tm solid laser is prospected, aiming to provide some guidance and inspiration for techni.cians in related fields.