We demonstrate a 30-W all-fiberized laser in a master oscillator power amplifier (MOPA) structure with a central wavelength of 1 950 nm. The laser is a continuous-wave (CW) operation with double-clad Tm-doped silica fiber pumped by pigtailed laser diodes with a central wavelength of 793 nm. The optical-to-optical efficiency of the MOPA system is 37.5% with respect to the total 80-W pump power. The maximal slope efficiency of the system is approximately 43%, which belongs to the main amplifier and exceeds the Stoke limit. No obvious amplified spontaneous emitting (ASE) is observed in the experiment, and the power can be scaled straightforwardly by improving the pump power.